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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
4 | * | |
5 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
6 | * been a further revision of this protocol since which is now supported. | |
7 | * | |
8 | * If you have trouble with this module be careful what gcc you have used, | |
9 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
10 | * seems to fall out with gcc 2.6.2. | |
11 | * | |
1da177e4 | 12 | * Authors: |
113aa838 | 13 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 | 14 | * |
1da177e4 LT |
15 | * Fixes: |
16 | * | |
17 | * Alan Cox : Added lots of __inline__ to optimise | |
18 | * the memory usage of all the tiny little | |
19 | * functions. | |
20 | * Alan Cox : Dumped the header building experiment. | |
21 | * Alan Cox : Minor tweaks ready for multicast routing | |
22 | * and extended IGMP protocol. | |
23 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
24 | * writes utterly bogus code otherwise (sigh) | |
25 | * fixed IGMP loopback to behave in the manner | |
26 | * desired by mrouted, fixed the fact it has been | |
27 | * broken since 1.3.6 and cleaned up a few minor | |
28 | * points. | |
29 | * | |
30 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
31 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 32 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
33 | * ipmulti-3.5 source code. |
34 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
35 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
36 | * the mrouted version on that device. | |
37 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
38 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
39 | * to identify the multicast router version | |
40 | * and do what the IGMP version 2 specified. | |
41 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
42 | * Tsu-Sheng Tsao if the specified time expired. | |
43 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
44 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
45 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
46 | * memberships but was being deleted, |
47 | * which caused a "del_timer() called | |
1da177e4 LT |
48 | * from %p with timer not initialized\n" |
49 | * message (960131). | |
e905a9ed | 50 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
51 | * igmp_timer_expire function (960205). |
52 | * Christian Daudt : igmp_heard_report now only calls | |
53 | * igmp_timer_expire if tm->running is | |
54 | * true (960216). | |
55 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
56 | * igmp_heard_query never trigger. Expiry | |
57 | * miscalculation fixed in igmp_heard_query | |
58 | * and random() made to return unsigned to | |
59 | * prevent negative expiry times. | |
60 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
61 | * fix from pending 2.1.x patches. | |
62 | * Alan Cox: Forget to enable FDDI support earlier. | |
63 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
64 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
65 | * David L Stevens: IGMPv3 support, with help from | |
66 | * Vinay Kulkarni | |
67 | */ | |
68 | ||
1da177e4 | 69 | #include <linux/module.h> |
5a0e3ad6 | 70 | #include <linux/slab.h> |
7c0f6ba6 | 71 | #include <linux/uaccess.h> |
1da177e4 LT |
72 | #include <linux/types.h> |
73 | #include <linux/kernel.h> | |
74 | #include <linux/jiffies.h> | |
75 | #include <linux/string.h> | |
76 | #include <linux/socket.h> | |
77 | #include <linux/sockios.h> | |
78 | #include <linux/in.h> | |
79 | #include <linux/inet.h> | |
80 | #include <linux/netdevice.h> | |
81 | #include <linux/skbuff.h> | |
82 | #include <linux/inetdevice.h> | |
83 | #include <linux/igmp.h> | |
84 | #include <linux/if_arp.h> | |
85 | #include <linux/rtnetlink.h> | |
86 | #include <linux/times.h> | |
9d4a0314 | 87 | #include <linux/pkt_sched.h> |
a46182b0 | 88 | #include <linux/byteorder/generic.h> |
14c85021 | 89 | |
457c4cbc | 90 | #include <net/net_namespace.h> |
14c85021 | 91 | #include <net/arp.h> |
1da177e4 LT |
92 | #include <net/ip.h> |
93 | #include <net/protocol.h> | |
94 | #include <net/route.h> | |
95 | #include <net/sock.h> | |
96 | #include <net/checksum.h> | |
93a714d6 | 97 | #include <net/inet_common.h> |
1da177e4 LT |
98 | #include <linux/netfilter_ipv4.h> |
99 | #ifdef CONFIG_IP_MROUTE | |
100 | #include <linux/mroute.h> | |
101 | #endif | |
102 | #ifdef CONFIG_PROC_FS | |
103 | #include <linux/proc_fs.h> | |
104 | #include <linux/seq_file.h> | |
105 | #endif | |
106 | ||
1da177e4 LT |
107 | #ifdef CONFIG_IP_MULTICAST |
108 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
109 | ||
966c37f2 | 110 | #define IGMP_QUERY_INTERVAL (125*HZ) |
436f7c20 | 111 | #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) |
1da177e4 | 112 | |
436f7c20 | 113 | #define IGMP_INITIAL_REPORT_DELAY (1) |
1da177e4 | 114 | |
436f7c20 | 115 | /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! |
1da177e4 LT |
116 | * IGMP specs require to report membership immediately after |
117 | * joining a group, but we delay the first report by a | |
118 | * small interval. It seems more natural and still does not | |
119 | * contradict to specs provided this delay is small enough. | |
120 | */ | |
121 | ||
42f811b8 | 122 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 123 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
124 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
125 | ((in_dev)->mr_v1_seen && \ | |
126 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
127 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 128 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
129 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
130 | ((in_dev)->mr_v2_seen && \ | |
131 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 | 132 | |
cab70040 WM |
133 | static int unsolicited_report_interval(struct in_device *in_dev) |
134 | { | |
2690048c WM |
135 | int interval_ms, interval_jiffies; |
136 | ||
cab70040 | 137 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
2690048c WM |
138 | interval_ms = IN_DEV_CONF_GET( |
139 | in_dev, | |
140 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
cab70040 | 141 | else /* v3 */ |
2690048c WM |
142 | interval_ms = IN_DEV_CONF_GET( |
143 | in_dev, | |
144 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
145 | ||
146 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
147 | ||
148 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
149 | * we always return a positive value. | |
150 | */ | |
151 | if (interval_jiffies <= 0) | |
152 | interval_jiffies = 1; | |
153 | return interval_jiffies; | |
cab70040 WM |
154 | } |
155 | ||
9fb20801 FF |
156 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, |
157 | gfp_t gfp); | |
24803f38 | 158 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
1da177e4 LT |
159 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
160 | static int sf_setstate(struct ip_mc_list *pmc); | |
161 | static void sf_markstate(struct ip_mc_list *pmc); | |
162 | #endif | |
163 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
164 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
165 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
166 | |
167 | static void ip_ma_put(struct ip_mc_list *im) | |
168 | { | |
8851ab52 | 169 | if (refcount_dec_and_test(&im->refcnt)) { |
1da177e4 | 170 | in_dev_put(im->interface); |
42ea299d | 171 | kfree_rcu(im, rcu); |
1da177e4 LT |
172 | } |
173 | } | |
174 | ||
d9aa9380 DM |
175 | #define for_each_pmc_rcu(in_dev, pmc) \ |
176 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
177 | pmc != NULL; \ | |
178 | pmc = rcu_dereference(pmc->next_rcu)) | |
179 | ||
180 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
181 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
182 | pmc != NULL; \ | |
183 | pmc = rtnl_dereference(pmc->next_rcu)) | |
184 | ||
903869bd ED |
185 | static void ip_sf_list_clear_all(struct ip_sf_list *psf) |
186 | { | |
187 | struct ip_sf_list *next; | |
188 | ||
189 | while (psf) { | |
190 | next = psf->sf_next; | |
191 | kfree(psf); | |
192 | psf = next; | |
193 | } | |
194 | } | |
195 | ||
1da177e4 LT |
196 | #ifdef CONFIG_IP_MULTICAST |
197 | ||
198 | /* | |
199 | * Timer management | |
200 | */ | |
201 | ||
1d7138de | 202 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
203 | { |
204 | spin_lock_bh(&im->lock); | |
205 | if (del_timer(&im->timer)) | |
8851ab52 | 206 | refcount_dec(&im->refcnt); |
a7e9ff73 | 207 | im->tm_running = 0; |
1da177e4 LT |
208 | im->reporter = 0; |
209 | im->unsolicit_count = 0; | |
210 | spin_unlock_bh(&im->lock); | |
211 | } | |
212 | ||
213 | /* It must be called with locked im->lock */ | |
214 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
215 | { | |
63862b5b | 216 | int tv = prandom_u32() % max_delay; |
1da177e4 | 217 | |
a7e9ff73 | 218 | im->tm_running = 1; |
1da177e4 | 219 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
8851ab52 | 220 | refcount_inc(&im->refcnt); |
1da177e4 LT |
221 | } |
222 | ||
223 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
224 | { | |
63862b5b | 225 | int tv = prandom_u32() % in_dev->mr_maxdelay; |
7ababb78 MT |
226 | unsigned long exp = jiffies + tv + 2; |
227 | ||
228 | if (in_dev->mr_gq_running && | |
229 | time_after_eq(exp, (in_dev->mr_gq_timer).expires)) | |
230 | return; | |
1da177e4 LT |
231 | |
232 | in_dev->mr_gq_running = 1; | |
7ababb78 | 233 | if (!mod_timer(&in_dev->mr_gq_timer, exp)) |
1da177e4 LT |
234 | in_dev_hold(in_dev); |
235 | } | |
236 | ||
237 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
238 | { | |
63862b5b | 239 | int tv = prandom_u32() % delay; |
1da177e4 LT |
240 | |
241 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
242 | in_dev_hold(in_dev); | |
243 | } | |
244 | ||
245 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
246 | { | |
247 | spin_lock_bh(&im->lock); | |
248 | im->unsolicit_count = 0; | |
249 | if (del_timer(&im->timer)) { | |
250 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
251 | add_timer(&im->timer); | |
a7e9ff73 | 252 | im->tm_running = 1; |
1da177e4 LT |
253 | spin_unlock_bh(&im->lock); |
254 | return; | |
255 | } | |
8851ab52 | 256 | refcount_dec(&im->refcnt); |
1da177e4 LT |
257 | } |
258 | igmp_start_timer(im, max_delay); | |
259 | spin_unlock_bh(&im->lock); | |
260 | } | |
261 | ||
262 | ||
263 | /* | |
264 | * Send an IGMP report. | |
265 | */ | |
266 | ||
267 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
268 | ||
269 | ||
270 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
271 | int gdeleted, int sdeleted) | |
272 | { | |
273 | switch (type) { | |
274 | case IGMPV3_MODE_IS_INCLUDE: | |
275 | case IGMPV3_MODE_IS_EXCLUDE: | |
276 | if (gdeleted || sdeleted) | |
277 | return 0; | |
ad12583f DS |
278 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
279 | if (pmc->sfmode == MCAST_INCLUDE) | |
280 | return 1; | |
281 | /* don't include if this source is excluded | |
282 | * in all filters | |
283 | */ | |
284 | if (psf->sf_count[MCAST_INCLUDE]) | |
285 | return type == IGMPV3_MODE_IS_INCLUDE; | |
286 | return pmc->sfcount[MCAST_EXCLUDE] == | |
287 | psf->sf_count[MCAST_EXCLUDE]; | |
288 | } | |
289 | return 0; | |
1da177e4 LT |
290 | case IGMPV3_CHANGE_TO_INCLUDE: |
291 | if (gdeleted || sdeleted) | |
292 | return 0; | |
293 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
294 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
295 | if (gdeleted || sdeleted) | |
296 | return 0; | |
297 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
298 | psf->sf_count[MCAST_INCLUDE]) | |
299 | return 0; | |
300 | return pmc->sfcount[MCAST_EXCLUDE] == | |
301 | psf->sf_count[MCAST_EXCLUDE]; | |
302 | case IGMPV3_ALLOW_NEW_SOURCES: | |
303 | if (gdeleted || !psf->sf_crcount) | |
304 | return 0; | |
305 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
306 | case IGMPV3_BLOCK_OLD_SOURCES: | |
307 | if (pmc->sfmode == MCAST_INCLUDE) | |
308 | return gdeleted || (psf->sf_crcount && sdeleted); | |
309 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
310 | } | |
311 | return 0; | |
312 | } | |
313 | ||
314 | static int | |
315 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
316 | { | |
317 | struct ip_sf_list *psf; | |
318 | int scount = 0; | |
319 | ||
c71151f0 | 320 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
321 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
322 | continue; | |
323 | scount++; | |
324 | } | |
325 | return scount; | |
326 | } | |
327 | ||
a46182b0 KC |
328 | /* source address selection per RFC 3376 section 4.2.13 */ |
329 | static __be32 igmpv3_get_srcaddr(struct net_device *dev, | |
330 | const struct flowi4 *fl4) | |
331 | { | |
332 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
cd5a411d | 333 | const struct in_ifaddr *ifa; |
a46182b0 KC |
334 | |
335 | if (!in_dev) | |
336 | return htonl(INADDR_ANY); | |
337 | ||
cd5a411d | 338 | in_dev_for_each_ifa_rcu(ifa, in_dev) { |
ad23b750 | 339 | if (fl4->saddr == ifa->ifa_local) |
a46182b0 | 340 | return fl4->saddr; |
cd5a411d | 341 | } |
a46182b0 KC |
342 | |
343 | return htonl(INADDR_ANY); | |
344 | } | |
345 | ||
4c672e4b | 346 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
1da177e4 LT |
347 | { |
348 | struct sk_buff *skb; | |
349 | struct rtable *rt; | |
350 | struct iphdr *pip; | |
351 | struct igmpv3_report *pig; | |
877acedc | 352 | struct net *net = dev_net(dev); |
31e4543d | 353 | struct flowi4 fl4; |
66088243 HX |
354 | int hlen = LL_RESERVED_SPACE(dev); |
355 | int tlen = dev->needed_tailroom; | |
4c672e4b | 356 | unsigned int size = mtu; |
1da177e4 | 357 | |
57e1ab6e | 358 | while (1) { |
66088243 | 359 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
360 | GFP_ATOMIC | __GFP_NOWARN); |
361 | if (skb) | |
362 | break; | |
363 | size >>= 1; | |
364 | if (size < 256) | |
365 | return NULL; | |
366 | } | |
9d4a0314 | 367 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 368 | |
31e4543d | 369 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
370 | 0, 0, |
371 | IPPROTO_IGMP, 0, dev->ifindex); | |
372 | if (IS_ERR(rt)) { | |
373 | kfree_skb(skb); | |
374 | return NULL; | |
1da177e4 | 375 | } |
1da177e4 | 376 | |
d8d1f30b | 377 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
378 | skb->dev = dev; |
379 | ||
66088243 | 380 | skb_reserve(skb, hlen); |
1837b2e2 | 381 | skb_tailroom_reserve(skb, mtu, tlen); |
1da177e4 | 382 | |
7e28ecc2 | 383 | skb_reset_network_header(skb); |
eddc9ec5 | 384 | pip = ip_hdr(skb); |
7e28ecc2 | 385 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
386 | |
387 | pip->version = 4; | |
388 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
389 | pip->tos = 0xc0; | |
390 | pip->frag_off = htons(IP_DF); | |
391 | pip->ttl = 1; | |
492f64ce | 392 | pip->daddr = fl4.daddr; |
e7aadb27 ED |
393 | |
394 | rcu_read_lock(); | |
a46182b0 | 395 | pip->saddr = igmpv3_get_srcaddr(dev, &fl4); |
e7aadb27 ED |
396 | rcu_read_unlock(); |
397 | ||
1da177e4 LT |
398 | pip->protocol = IPPROTO_IGMP; |
399 | pip->tot_len = 0; /* filled in later */ | |
b6a7719a | 400 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
401 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
402 | ((u8 *)&pip[1])[1] = 4; | |
403 | ((u8 *)&pip[1])[2] = 0; | |
404 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 405 | |
b0e380b1 | 406 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 407 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 408 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
409 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
410 | pig->resv1 = 0; | |
411 | pig->csum = 0; | |
412 | pig->resv2 = 0; | |
413 | pig->ngrec = 0; | |
414 | return skb; | |
415 | } | |
416 | ||
417 | static int igmpv3_sendpack(struct sk_buff *skb) | |
418 | { | |
d9edf9e2 | 419 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 420 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 421 | |
d9edf9e2 | 422 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 423 | |
33224b16 | 424 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
1da177e4 LT |
425 | } |
426 | ||
427 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
428 | { | |
a7e9ff73 | 429 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
430 | } |
431 | ||
432 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
b5476022 | 433 | int type, struct igmpv3_grec **ppgr, unsigned int mtu) |
1da177e4 LT |
434 | { |
435 | struct net_device *dev = pmc->interface->dev; | |
436 | struct igmpv3_report *pih; | |
437 | struct igmpv3_grec *pgr; | |
438 | ||
b5476022 ED |
439 | if (!skb) { |
440 | skb = igmpv3_newpack(dev, mtu); | |
441 | if (!skb) | |
442 | return NULL; | |
443 | } | |
4df864c1 | 444 | pgr = skb_put(skb, sizeof(struct igmpv3_grec)); |
1da177e4 LT |
445 | pgr->grec_type = type; |
446 | pgr->grec_auxwords = 0; | |
447 | pgr->grec_nsrcs = 0; | |
448 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 449 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
450 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
451 | *ppgr = pgr; | |
452 | return skb; | |
453 | } | |
454 | ||
4c672e4b | 455 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
456 | |
457 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
458 | int type, int gdeleted, int sdeleted) | |
459 | { | |
460 | struct net_device *dev = pmc->interface->dev; | |
87a8a2ae | 461 | struct net *net = dev_net(dev); |
1da177e4 LT |
462 | struct igmpv3_report *pih; |
463 | struct igmpv3_grec *pgr = NULL; | |
464 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 465 | int scount, stotal, first, isquery, truncate; |
b5476022 | 466 | unsigned int mtu; |
1da177e4 LT |
467 | |
468 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
469 | return skb; | |
87a8a2ae | 470 | if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 471 | return skb; |
1da177e4 | 472 | |
b5476022 ED |
473 | mtu = READ_ONCE(dev->mtu); |
474 | if (mtu < IPV4_MIN_MTU) | |
475 | return skb; | |
476 | ||
1da177e4 LT |
477 | isquery = type == IGMPV3_MODE_IS_INCLUDE || |
478 | type == IGMPV3_MODE_IS_EXCLUDE; | |
479 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
480 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
481 | ||
ad12583f DS |
482 | stotal = scount = 0; |
483 | ||
1da177e4 LT |
484 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
485 | ||
ad12583f DS |
486 | if (!*psf_list) |
487 | goto empty_source; | |
488 | ||
d9edf9e2 | 489 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
490 | |
491 | /* EX and TO_EX get a fresh packet, if needed */ | |
492 | if (truncate) { | |
493 | if (pih && pih->ngrec && | |
494 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
495 | if (skb) | |
496 | igmpv3_sendpack(skb); | |
b5476022 | 497 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
498 | } |
499 | } | |
500 | first = 1; | |
1da177e4 | 501 | psf_prev = NULL; |
c71151f0 | 502 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 503 | __be32 *psrc; |
1da177e4 LT |
504 | |
505 | psf_next = psf->sf_next; | |
506 | ||
507 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
508 | psf_prev = psf; | |
509 | continue; | |
510 | } | |
511 | ||
a052517a HL |
512 | /* Based on RFC3376 5.1. Should not send source-list change |
513 | * records when there is a filter mode change. | |
514 | */ | |
515 | if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || | |
516 | (!gdeleted && pmc->crcount)) && | |
517 | (type == IGMPV3_ALLOW_NEW_SOURCES || | |
518 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) | |
519 | goto decrease_sf_crcount; | |
520 | ||
1da177e4 LT |
521 | /* clear marks on query responses */ |
522 | if (isquery) | |
523 | psf->sf_gsresp = 0; | |
524 | ||
63007727 | 525 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
526 | first*sizeof(struct igmpv3_grec)) { |
527 | if (truncate && !first) | |
528 | break; /* truncate these */ | |
529 | if (pgr) | |
530 | pgr->grec_nsrcs = htons(scount); | |
531 | if (skb) | |
532 | igmpv3_sendpack(skb); | |
b5476022 | 533 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
534 | first = 1; |
535 | scount = 0; | |
536 | } | |
537 | if (first) { | |
b5476022 | 538 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
1da177e4 LT |
539 | first = 0; |
540 | } | |
cc63f70b AD |
541 | if (!skb) |
542 | return NULL; | |
4df864c1 | 543 | psrc = skb_put(skb, sizeof(__be32)); |
1da177e4 | 544 | *psrc = psf->sf_inaddr; |
ad12583f | 545 | scount++; stotal++; |
1da177e4 LT |
546 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
547 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
a052517a | 548 | decrease_sf_crcount: |
1da177e4 LT |
549 | psf->sf_crcount--; |
550 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
551 | if (psf_prev) | |
552 | psf_prev->sf_next = psf->sf_next; | |
553 | else | |
554 | *psf_list = psf->sf_next; | |
555 | kfree(psf); | |
556 | continue; | |
557 | } | |
558 | } | |
559 | psf_prev = psf; | |
560 | } | |
ad12583f DS |
561 | |
562 | empty_source: | |
563 | if (!stotal) { | |
564 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
565 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
566 | return skb; | |
567 | if (pmc->crcount || isquery) { | |
568 | /* make sure we have room for group header */ | |
c71151f0 | 569 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
570 | igmpv3_sendpack(skb); |
571 | skb = NULL; /* add_grhead will get a new one */ | |
572 | } | |
b5476022 | 573 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
ad12583f DS |
574 | } |
575 | } | |
1da177e4 LT |
576 | if (pgr) |
577 | pgr->grec_nsrcs = htons(scount); | |
578 | ||
579 | if (isquery) | |
580 | pmc->gsquery = 0; /* clear query state on report */ | |
581 | return skb; | |
582 | } | |
583 | ||
584 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
585 | { | |
586 | struct sk_buff *skb = NULL; | |
87a8a2ae | 587 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
588 | int type; |
589 | ||
590 | if (!pmc) { | |
1d7138de ED |
591 | rcu_read_lock(); |
592 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
593 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
594 | continue; | |
df2cf4a7 | 595 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
87a8a2ae | 596 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 597 | continue; |
1da177e4 LT |
598 | spin_lock_bh(&pmc->lock); |
599 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
600 | type = IGMPV3_MODE_IS_EXCLUDE; | |
601 | else | |
602 | type = IGMPV3_MODE_IS_INCLUDE; | |
603 | skb = add_grec(skb, pmc, type, 0, 0); | |
604 | spin_unlock_bh(&pmc->lock); | |
605 | } | |
1d7138de | 606 | rcu_read_unlock(); |
1da177e4 LT |
607 | } else { |
608 | spin_lock_bh(&pmc->lock); | |
609 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
610 | type = IGMPV3_MODE_IS_EXCLUDE; | |
611 | else | |
612 | type = IGMPV3_MODE_IS_INCLUDE; | |
613 | skb = add_grec(skb, pmc, type, 0, 0); | |
614 | spin_unlock_bh(&pmc->lock); | |
615 | } | |
616 | if (!skb) | |
617 | return 0; | |
618 | return igmpv3_sendpack(skb); | |
619 | } | |
620 | ||
621 | /* | |
622 | * remove zero-count source records from a source filter list | |
623 | */ | |
624 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
625 | { | |
626 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
627 | ||
628 | psf_prev = NULL; | |
c71151f0 | 629 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
630 | psf_next = psf->sf_next; |
631 | if (psf->sf_crcount == 0) { | |
632 | if (psf_prev) | |
633 | psf_prev->sf_next = psf->sf_next; | |
634 | else | |
635 | *ppsf = psf->sf_next; | |
636 | kfree(psf); | |
637 | } else | |
638 | psf_prev = psf; | |
639 | } | |
640 | } | |
641 | ||
3580d04a ED |
642 | static void kfree_pmc(struct ip_mc_list *pmc) |
643 | { | |
644 | ip_sf_list_clear_all(pmc->sources); | |
645 | ip_sf_list_clear_all(pmc->tomb); | |
646 | kfree(pmc); | |
647 | } | |
648 | ||
1da177e4 LT |
649 | static void igmpv3_send_cr(struct in_device *in_dev) |
650 | { | |
651 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
652 | struct sk_buff *skb = NULL; | |
653 | int type, dtype; | |
654 | ||
1d7138de | 655 | rcu_read_lock(); |
1da177e4 LT |
656 | spin_lock_bh(&in_dev->mc_tomb_lock); |
657 | ||
658 | /* deleted MCA's */ | |
659 | pmc_prev = NULL; | |
c71151f0 | 660 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
661 | pmc_next = pmc->next; |
662 | if (pmc->sfmode == MCAST_INCLUDE) { | |
663 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
664 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
665 | skb = add_grec(skb, pmc, type, 1, 0); | |
666 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
667 | } | |
668 | if (pmc->crcount) { | |
1da177e4 LT |
669 | if (pmc->sfmode == MCAST_EXCLUDE) { |
670 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
671 | skb = add_grec(skb, pmc, type, 1, 0); | |
672 | } | |
ad12583f | 673 | pmc->crcount--; |
1da177e4 LT |
674 | if (pmc->crcount == 0) { |
675 | igmpv3_clear_zeros(&pmc->tomb); | |
676 | igmpv3_clear_zeros(&pmc->sources); | |
677 | } | |
678 | } | |
679 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
680 | if (pmc_prev) | |
681 | pmc_prev->next = pmc_next; | |
682 | else | |
683 | in_dev->mc_tomb = pmc_next; | |
684 | in_dev_put(pmc->interface); | |
3580d04a | 685 | kfree_pmc(pmc); |
1da177e4 LT |
686 | } else |
687 | pmc_prev = pmc; | |
688 | } | |
689 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
690 | ||
691 | /* change recs */ | |
1d7138de | 692 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
693 | spin_lock_bh(&pmc->lock); |
694 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
695 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
696 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
697 | } else { | |
698 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
699 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
700 | } | |
701 | skb = add_grec(skb, pmc, type, 0, 0); | |
702 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
703 | ||
704 | /* filter mode changes */ | |
705 | if (pmc->crcount) { | |
1da177e4 LT |
706 | if (pmc->sfmode == MCAST_EXCLUDE) |
707 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
708 | else | |
709 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
710 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 711 | pmc->crcount--; |
1da177e4 LT |
712 | } |
713 | spin_unlock_bh(&pmc->lock); | |
714 | } | |
1d7138de | 715 | rcu_read_unlock(); |
1da177e4 LT |
716 | |
717 | if (!skb) | |
718 | return; | |
719 | (void) igmpv3_sendpack(skb); | |
720 | } | |
721 | ||
722 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
723 | int type) | |
724 | { | |
725 | struct sk_buff *skb; | |
726 | struct iphdr *iph; | |
727 | struct igmphdr *ih; | |
728 | struct rtable *rt; | |
729 | struct net_device *dev = in_dev->dev; | |
877acedc | 730 | struct net *net = dev_net(dev); |
63007727 | 731 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 732 | struct flowi4 fl4; |
63007727 | 733 | __be32 dst; |
66088243 | 734 | int hlen, tlen; |
1da177e4 LT |
735 | |
736 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
737 | return igmpv3_send_report(in_dev, pmc); | |
df2cf4a7 | 738 | |
87a8a2ae | 739 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 PD |
740 | return 0; |
741 | ||
742 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
1da177e4 LT |
743 | dst = IGMP_ALL_ROUTER; |
744 | else | |
745 | dst = group; | |
746 | ||
31e4543d | 747 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
748 | 0, 0, |
749 | IPPROTO_IGMP, 0, dev->ifindex); | |
750 | if (IS_ERR(rt)) | |
751 | return -1; | |
752 | ||
66088243 HX |
753 | hlen = LL_RESERVED_SPACE(dev); |
754 | tlen = dev->needed_tailroom; | |
755 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
51456b29 | 756 | if (!skb) { |
1da177e4 LT |
757 | ip_rt_put(rt); |
758 | return -1; | |
759 | } | |
9d4a0314 | 760 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 761 | |
d8d1f30b | 762 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 763 | |
66088243 | 764 | skb_reserve(skb, hlen); |
1da177e4 | 765 | |
7e28ecc2 | 766 | skb_reset_network_header(skb); |
eddc9ec5 | 767 | iph = ip_hdr(skb); |
7e28ecc2 | 768 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
769 | |
770 | iph->version = 4; | |
771 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
772 | iph->tos = 0xc0; | |
773 | iph->frag_off = htons(IP_DF); | |
774 | iph->ttl = 1; | |
775 | iph->daddr = dst; | |
492f64ce | 776 | iph->saddr = fl4.saddr; |
1da177e4 | 777 | iph->protocol = IPPROTO_IGMP; |
b6a7719a | 778 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
779 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
780 | ((u8 *)&iph[1])[1] = 4; | |
781 | ((u8 *)&iph[1])[2] = 0; | |
782 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 | 783 | |
4df864c1 | 784 | ih = skb_put(skb, sizeof(struct igmphdr)); |
a7e9ff73 JK |
785 | ih->type = type; |
786 | ih->code = 0; | |
787 | ih->csum = 0; | |
788 | ih->group = group; | |
789 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 790 | |
33224b16 | 791 | return ip_local_out(net, skb->sk, skb); |
1da177e4 LT |
792 | } |
793 | ||
e99e88a9 | 794 | static void igmp_gq_timer_expire(struct timer_list *t) |
1da177e4 | 795 | { |
e99e88a9 | 796 | struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer); |
1da177e4 LT |
797 | |
798 | in_dev->mr_gq_running = 0; | |
799 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 800 | in_dev_put(in_dev); |
1da177e4 LT |
801 | } |
802 | ||
e99e88a9 | 803 | static void igmp_ifc_timer_expire(struct timer_list *t) |
1da177e4 | 804 | { |
e99e88a9 | 805 | struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer); |
b69dd5b3 | 806 | u32 mr_ifc_count; |
1da177e4 LT |
807 | |
808 | igmpv3_send_cr(in_dev); | |
4a2b285e ED |
809 | restart: |
810 | mr_ifc_count = READ_ONCE(in_dev->mr_ifc_count); | |
811 | ||
812 | if (mr_ifc_count) { | |
813 | if (cmpxchg(&in_dev->mr_ifc_count, | |
814 | mr_ifc_count, | |
815 | mr_ifc_count - 1) != mr_ifc_count) | |
816 | goto restart; | |
cab70040 WM |
817 | igmp_ifc_start_timer(in_dev, |
818 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 819 | } |
e2401654 | 820 | in_dev_put(in_dev); |
1da177e4 LT |
821 | } |
822 | ||
823 | static void igmp_ifc_event(struct in_device *in_dev) | |
824 | { | |
165094af | 825 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
826 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
827 | return; | |
4a2b285e | 828 | WRITE_ONCE(in_dev->mr_ifc_count, in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv); |
1da177e4 LT |
829 | igmp_ifc_start_timer(in_dev, 1); |
830 | } | |
831 | ||
832 | ||
e99e88a9 | 833 | static void igmp_timer_expire(struct timer_list *t) |
1da177e4 | 834 | { |
e99e88a9 | 835 | struct ip_mc_list *im = from_timer(im, t, timer); |
1da177e4 LT |
836 | struct in_device *in_dev = im->interface; |
837 | ||
838 | spin_lock(&im->lock); | |
a7e9ff73 | 839 | im->tm_running = 0; |
1da177e4 | 840 | |
4fb7253e | 841 | if (im->unsolicit_count && --im->unsolicit_count) |
cab70040 | 842 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
4fb7253e | 843 | |
1da177e4 LT |
844 | im->reporter = 1; |
845 | spin_unlock(&im->lock); | |
846 | ||
847 | if (IGMP_V1_SEEN(in_dev)) | |
848 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
849 | else if (IGMP_V2_SEEN(in_dev)) | |
850 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
851 | else | |
852 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
853 | ||
854 | ip_ma_put(im); | |
855 | } | |
856 | ||
ad12583f | 857 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 858 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
859 | { |
860 | struct ip_sf_list *psf; | |
861 | int i, scount; | |
862 | ||
ad12583f | 863 | scount = 0; |
c71151f0 | 864 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
865 | if (scount == nsrcs) |
866 | break; | |
c71151f0 | 867 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 868 | /* skip inactive filters */ |
e05c4ad3 | 869 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
870 | pmc->sfcount[MCAST_EXCLUDE] != |
871 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 872 | break; |
ad12583f DS |
873 | if (srcs[i] == psf->sf_inaddr) { |
874 | scount++; | |
875 | break; | |
876 | } | |
877 | } | |
878 | } | |
879 | pmc->gsquery = 0; | |
880 | if (scount == nsrcs) /* all sources excluded */ | |
881 | return 0; | |
882 | return 1; | |
883 | } | |
884 | ||
ea4d9e72 | 885 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
886 | { |
887 | struct ip_sf_list *psf; | |
888 | int i, scount; | |
889 | ||
890 | if (pmc->sfmode == MCAST_EXCLUDE) | |
891 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
892 | ||
893 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 894 | scount = 0; |
c71151f0 | 895 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
896 | if (scount == nsrcs) |
897 | break; | |
c71151f0 | 898 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
899 | if (srcs[i] == psf->sf_inaddr) { |
900 | psf->sf_gsresp = 1; | |
901 | scount++; | |
902 | break; | |
903 | } | |
904 | } | |
ad12583f DS |
905 | if (!scount) { |
906 | pmc->gsquery = 0; | |
907 | return 0; | |
908 | } | |
909 | pmc->gsquery = 1; | |
910 | return 1; | |
1da177e4 LT |
911 | } |
912 | ||
d679c532 ED |
913 | /* return true if packet was dropped */ |
914 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
915 | { |
916 | struct ip_mc_list *im; | |
87a8a2ae | 917 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
918 | |
919 | /* Timers are only set for non-local groups */ | |
920 | ||
921 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 922 | return false; |
87a8a2ae | 923 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 924 | return false; |
1da177e4 | 925 | |
1d7138de ED |
926 | rcu_read_lock(); |
927 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
928 | if (im->multiaddr == group) { |
929 | igmp_stop_timer(im); | |
930 | break; | |
931 | } | |
932 | } | |
1d7138de | 933 | rcu_read_unlock(); |
d679c532 | 934 | return false; |
1da177e4 LT |
935 | } |
936 | ||
d679c532 ED |
937 | /* return true if packet was dropped */ |
938 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
939 | int len) |
940 | { | |
d9edf9e2 ACM |
941 | struct igmphdr *ih = igmp_hdr(skb); |
942 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 943 | struct ip_mc_list *im; |
63007727 | 944 | __be32 group = ih->group; |
1da177e4 LT |
945 | int max_delay; |
946 | int mark = 0; | |
87a8a2ae | 947 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
948 | |
949 | ||
5b7c8406 | 950 | if (len == 8) { |
1da177e4 LT |
951 | if (ih->code == 0) { |
952 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 953 | |
436f7c20 | 954 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
1da177e4 | 955 | in_dev->mr_v1_seen = jiffies + |
966c37f2 HL |
956 | (in_dev->mr_qrv * in_dev->mr_qi) + |
957 | in_dev->mr_qri; | |
1da177e4 LT |
958 | group = 0; |
959 | } else { | |
960 | /* v2 router present */ | |
961 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
962 | in_dev->mr_v2_seen = jiffies + | |
966c37f2 HL |
963 | (in_dev->mr_qrv * in_dev->mr_qi) + |
964 | in_dev->mr_qri; | |
1da177e4 LT |
965 | } |
966 | /* cancel the interface change timer */ | |
4a2b285e | 967 | WRITE_ONCE(in_dev->mr_ifc_count, 0); |
1da177e4 LT |
968 | if (del_timer(&in_dev->mr_ifc_timer)) |
969 | __in_dev_put(in_dev); | |
970 | /* clear deleted report items */ | |
971 | igmpv3_clear_delrec(in_dev); | |
972 | } else if (len < 12) { | |
d679c532 | 973 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
974 | } else if (IGMP_V1_SEEN(in_dev)) { |
975 | /* This is a v3 query with v1 queriers present */ | |
436f7c20 | 976 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
5b7c8406 DS |
977 | group = 0; |
978 | } else if (IGMP_V2_SEEN(in_dev)) { | |
979 | /* this is a v3 query with v2 queriers present; | |
980 | * Interpretation of the max_delay code is problematic here. | |
981 | * A real v2 host would use ih_code directly, while v3 has a | |
982 | * different encoding. We use the v3 encoding as more likely | |
983 | * to be intended in a v3 query. | |
984 | */ | |
985 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
986 | if (!max_delay) |
987 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
988 | } else { /* v3 */ |
989 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 990 | return true; |
e905a9ed | 991 | |
d9edf9e2 | 992 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 993 | if (ih3->nsrcs) { |
e905a9ed | 994 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 995 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 996 | return true; |
d9edf9e2 | 997 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
998 | } |
999 | ||
1000 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
1001 | if (!max_delay) | |
1002 | max_delay = 1; /* can't mod w/ 0 */ | |
1003 | in_dev->mr_maxdelay = max_delay; | |
966c37f2 HL |
1004 | |
1005 | /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently | |
1006 | * received value was zero, use the default or statically | |
1007 | * configured value. | |
1008 | */ | |
1009 | in_dev->mr_qrv = ih3->qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1010 | in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL; | |
1011 | ||
1012 | /* RFC3376, 8.3. Query Response Interval: | |
1013 | * The number of seconds represented by the [Query Response | |
1014 | * Interval] must be less than the [Query Interval]. | |
1015 | */ | |
1016 | if (in_dev->mr_qri >= in_dev->mr_qi) | |
1017 | in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ; | |
1018 | ||
1da177e4 LT |
1019 | if (!group) { /* general query */ |
1020 | if (ih3->nsrcs) | |
b47bd8d2 | 1021 | return true; /* no sources allowed */ |
1da177e4 | 1022 | igmp_gq_start_timer(in_dev); |
d679c532 | 1023 | return false; |
1da177e4 LT |
1024 | } |
1025 | /* mark sources to include, if group & source-specific */ | |
1026 | mark = ih3->nsrcs != 0; | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * - Start the timers in all of our membership records | |
1031 | * that the query applies to for the interface on | |
1032 | * which the query arrived excl. those that belong | |
1033 | * to a "local" group (224.0.0.X) | |
1034 | * - For timers already running check if they need to | |
1035 | * be reset. | |
1036 | * - Use the igmp->igmp_code field as the maximum | |
1037 | * delay possible | |
1038 | */ | |
1d7138de ED |
1039 | rcu_read_lock(); |
1040 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
1041 | int changed; |
1042 | ||
1da177e4 LT |
1043 | if (group && group != im->multiaddr) |
1044 | continue; | |
1045 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1046 | continue; | |
df2cf4a7 | 1047 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1048 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1049 | continue; |
1da177e4 LT |
1050 | spin_lock_bh(&im->lock); |
1051 | if (im->tm_running) | |
1052 | im->gsquery = im->gsquery && mark; | |
1053 | else | |
1054 | im->gsquery = mark; | |
ad12583f | 1055 | changed = !im->gsquery || |
e905a9ed | 1056 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 1057 | spin_unlock_bh(&im->lock); |
ad12583f DS |
1058 | if (changed) |
1059 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 1060 | } |
1d7138de | 1061 | rcu_read_unlock(); |
d679c532 | 1062 | return false; |
1da177e4 LT |
1063 | } |
1064 | ||
9a57a9d2 | 1065 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
1066 | int igmp_rcv(struct sk_buff *skb) |
1067 | { | |
1068 | /* This basically follows the spec line by line -- see RFC1112 */ | |
1069 | struct igmphdr *ih; | |
c7b725be DA |
1070 | struct net_device *dev = skb->dev; |
1071 | struct in_device *in_dev; | |
1da177e4 | 1072 | int len = skb->len; |
d679c532 | 1073 | bool dropped = true; |
1da177e4 | 1074 | |
c7b725be DA |
1075 | if (netif_is_l3_master(dev)) { |
1076 | dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif); | |
1077 | if (!dev) | |
1078 | goto drop; | |
1079 | } | |
1080 | ||
1081 | in_dev = __in_dev_get_rcu(dev); | |
51456b29 | 1082 | if (!in_dev) |
cd557bc1 | 1083 | goto drop; |
1da177e4 | 1084 | |
fb286bb2 | 1085 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 1086 | goto drop; |
fb286bb2 | 1087 | |
de08dc1a TH |
1088 | if (skb_checksum_simple_validate(skb)) |
1089 | goto drop; | |
1da177e4 | 1090 | |
d9edf9e2 | 1091 | ih = igmp_hdr(skb); |
1da177e4 LT |
1092 | switch (ih->type) { |
1093 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 1094 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
1095 | break; |
1096 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1097 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 1098 | /* Is it our report looped back? */ |
c7537967 | 1099 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1100 | break; |
24c69275 DS |
1101 | /* don't rely on MC router hearing unicast reports */ |
1102 | if (skb->pkt_type == PACKET_MULTICAST || | |
1103 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1104 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1105 | break; |
1106 | case IGMP_PIM: | |
1107 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1108 | return pim_rcv_v1(skb); |
1109 | #endif | |
c6b471e6 | 1110 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1111 | case IGMP_DVMRP: |
1112 | case IGMP_TRACE: | |
1113 | case IGMP_HOST_LEAVE_MESSAGE: | |
1114 | case IGMP_MTRACE: | |
1115 | case IGMP_MTRACE_RESP: | |
1116 | break; | |
1117 | default: | |
dd1c1853 | 1118 | break; |
1da177e4 | 1119 | } |
fb286bb2 | 1120 | |
cd557bc1 | 1121 | drop: |
d679c532 ED |
1122 | if (dropped) |
1123 | kfree_skb(skb); | |
1124 | else | |
1125 | consume_skb(skb); | |
1da177e4 LT |
1126 | return 0; |
1127 | } | |
1128 | ||
1129 | #endif | |
1130 | ||
1131 | ||
1132 | /* | |
1133 | * Add a filter to a device | |
1134 | */ | |
1135 | ||
63007727 | 1136 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1137 | { |
1138 | char buf[MAX_ADDR_LEN]; | |
1139 | struct net_device *dev = in_dev->dev; | |
1140 | ||
1141 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1142 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1143 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1144 | routine. Something sort of: |
1145 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1146 | --ANK | |
1147 | */ | |
1148 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1149 | dev_mc_add(dev, buf); |
1da177e4 LT |
1150 | } |
1151 | ||
1152 | /* | |
1153 | * Remove a filter from a device | |
1154 | */ | |
1155 | ||
63007727 | 1156 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1157 | { |
1158 | char buf[MAX_ADDR_LEN]; | |
1159 | struct net_device *dev = in_dev->dev; | |
1160 | ||
1161 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1162 | dev_mc_del(dev, buf); |
1da177e4 LT |
1163 | } |
1164 | ||
1165 | #ifdef CONFIG_IP_MULTICAST | |
1166 | /* | |
1167 | * deleted ip_mc_list manipulation | |
1168 | */ | |
9fb20801 FF |
1169 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, |
1170 | gfp_t gfp) | |
1da177e4 LT |
1171 | { |
1172 | struct ip_mc_list *pmc; | |
165094af | 1173 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1174 | |
1175 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1176 | * are actually used. In particular, the refcnt and users are not | |
1177 | * used for management of the delete list. Using the same structure | |
1178 | * for deleted items allows change reports to use common code with | |
1179 | * non-deleted or query-response MCA's. | |
1180 | */ | |
9fb20801 | 1181 | pmc = kzalloc(sizeof(*pmc), gfp); |
1da177e4 LT |
1182 | if (!pmc) |
1183 | return; | |
b4846fc3 | 1184 | spin_lock_init(&pmc->lock); |
1da177e4 LT |
1185 | spin_lock_bh(&im->lock); |
1186 | pmc->interface = im->interface; | |
1187 | in_dev_hold(in_dev); | |
1188 | pmc->multiaddr = im->multiaddr; | |
165094af | 1189 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1190 | pmc->sfmode = im->sfmode; |
1191 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1192 | struct ip_sf_list *psf; | |
1193 | ||
1194 | pmc->tomb = im->tomb; | |
1195 | pmc->sources = im->sources; | |
1196 | im->tomb = im->sources = NULL; | |
c71151f0 | 1197 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1198 | psf->sf_crcount = pmc->crcount; |
1199 | } | |
1200 | spin_unlock_bh(&im->lock); | |
1201 | ||
1202 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1203 | pmc->next = in_dev->mc_tomb; | |
1204 | in_dev->mc_tomb = pmc; | |
1205 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1206 | } | |
1207 | ||
24803f38 HL |
1208 | /* |
1209 | * restore ip_mc_list deleted records | |
1210 | */ | |
1211 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1da177e4 LT |
1212 | { |
1213 | struct ip_mc_list *pmc, *pmc_prev; | |
24803f38 HL |
1214 | struct ip_sf_list *psf; |
1215 | struct net *net = dev_net(in_dev->dev); | |
1216 | __be32 multiaddr = im->multiaddr; | |
1da177e4 LT |
1217 | |
1218 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1219 | pmc_prev = NULL; | |
c71151f0 | 1220 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1221 | if (pmc->multiaddr == multiaddr) |
1222 | break; | |
1223 | pmc_prev = pmc; | |
1224 | } | |
1225 | if (pmc) { | |
1226 | if (pmc_prev) | |
1227 | pmc_prev->next = pmc->next; | |
1228 | else | |
1229 | in_dev->mc_tomb = pmc->next; | |
1230 | } | |
1231 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
24803f38 HL |
1232 | |
1233 | spin_lock_bh(&im->lock); | |
1da177e4 | 1234 | if (pmc) { |
24803f38 | 1235 | im->interface = pmc->interface; |
08d3ffcc | 1236 | if (im->sfmode == MCAST_INCLUDE) { |
e5b1c6c6 ED |
1237 | swap(im->tomb, pmc->tomb); |
1238 | swap(im->sources, pmc->sources); | |
24803f38 | 1239 | for (psf = im->sources; psf; psf = psf->sf_next) |
6e2059b5 HL |
1240 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1241 | } else { | |
1242 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1da177e4 LT |
1243 | } |
1244 | in_dev_put(pmc->interface); | |
3580d04a | 1245 | kfree_pmc(pmc); |
1da177e4 | 1246 | } |
24803f38 | 1247 | spin_unlock_bh(&im->lock); |
1da177e4 LT |
1248 | } |
1249 | ||
24803f38 HL |
1250 | /* |
1251 | * flush ip_mc_list deleted records | |
1252 | */ | |
1da177e4 LT |
1253 | static void igmpv3_clear_delrec(struct in_device *in_dev) |
1254 | { | |
1255 | struct ip_mc_list *pmc, *nextpmc; | |
1256 | ||
1257 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1258 | pmc = in_dev->mc_tomb; | |
1259 | in_dev->mc_tomb = NULL; | |
1260 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1261 | ||
1262 | for (; pmc; pmc = nextpmc) { | |
1263 | nextpmc = pmc->next; | |
1264 | ip_mc_clear_src(pmc); | |
1265 | in_dev_put(pmc->interface); | |
3580d04a | 1266 | kfree_pmc(pmc); |
1da177e4 LT |
1267 | } |
1268 | /* clear dead sources, too */ | |
1d7138de ED |
1269 | rcu_read_lock(); |
1270 | for_each_pmc_rcu(in_dev, pmc) { | |
3580d04a | 1271 | struct ip_sf_list *psf; |
1da177e4 LT |
1272 | |
1273 | spin_lock_bh(&pmc->lock); | |
1274 | psf = pmc->tomb; | |
1275 | pmc->tomb = NULL; | |
1276 | spin_unlock_bh(&pmc->lock); | |
3580d04a | 1277 | ip_sf_list_clear_all(psf); |
1da177e4 | 1278 | } |
1d7138de | 1279 | rcu_read_unlock(); |
1da177e4 LT |
1280 | } |
1281 | #endif | |
1282 | ||
9fb20801 | 1283 | static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp) |
1da177e4 LT |
1284 | { |
1285 | struct in_device *in_dev = im->interface; | |
1286 | #ifdef CONFIG_IP_MULTICAST | |
87a8a2ae | 1287 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1288 | int reporter; |
1289 | #endif | |
1290 | ||
1291 | if (im->loaded) { | |
1292 | im->loaded = 0; | |
1293 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1294 | } | |
1295 | ||
1296 | #ifdef CONFIG_IP_MULTICAST | |
1297 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1298 | return; | |
87a8a2ae | 1299 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1300 | return; |
1da177e4 LT |
1301 | |
1302 | reporter = im->reporter; | |
1303 | igmp_stop_timer(im); | |
1304 | ||
1305 | if (!in_dev->dead) { | |
1306 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1307 | return; |
1da177e4 LT |
1308 | if (IGMP_V2_SEEN(in_dev)) { |
1309 | if (reporter) | |
1310 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1311 | return; |
1da177e4 LT |
1312 | } |
1313 | /* IGMPv3 */ | |
9fb20801 | 1314 | igmpv3_add_delrec(in_dev, im, gfp); |
1da177e4 LT |
1315 | |
1316 | igmp_ifc_event(in_dev); | |
1317 | } | |
1da177e4 | 1318 | #endif |
1da177e4 LT |
1319 | } |
1320 | ||
9fb20801 FF |
1321 | static void igmp_group_dropped(struct ip_mc_list *im) |
1322 | { | |
1323 | __igmp_group_dropped(im, GFP_KERNEL); | |
1324 | } | |
1325 | ||
0ae0d60a | 1326 | static void igmp_group_added(struct ip_mc_list *im) |
1da177e4 LT |
1327 | { |
1328 | struct in_device *in_dev = im->interface; | |
dcd87999 | 1329 | #ifdef CONFIG_IP_MULTICAST |
87a8a2ae | 1330 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1331 | #endif |
1da177e4 LT |
1332 | |
1333 | if (im->loaded == 0) { | |
1334 | im->loaded = 1; | |
1335 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1336 | } | |
1337 | ||
1338 | #ifdef CONFIG_IP_MULTICAST | |
1339 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1340 | return; | |
87a8a2ae | 1341 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1342 | return; |
1da177e4 LT |
1343 | |
1344 | if (in_dev->dead) | |
1345 | return; | |
ff06525f HL |
1346 | |
1347 | im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; | |
1da177e4 LT |
1348 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { |
1349 | spin_lock_bh(&im->lock); | |
436f7c20 | 1350 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); |
1da177e4 LT |
1351 | spin_unlock_bh(&im->lock); |
1352 | return; | |
1353 | } | |
1354 | /* else, v3 */ | |
1355 | ||
6e2059b5 HL |
1356 | /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should |
1357 | * not send filter-mode change record as the mode should be from | |
1358 | * IN() to IN(A). | |
1359 | */ | |
0ae0d60a | 1360 | if (im->sfmode == MCAST_EXCLUDE) |
6e2059b5 HL |
1361 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1362 | ||
1da177e4 LT |
1363 | igmp_ifc_event(in_dev); |
1364 | #endif | |
1365 | } | |
1366 | ||
1367 | ||
1368 | /* | |
1369 | * Multicast list managers | |
1370 | */ | |
1371 | ||
e9897071 ED |
1372 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1373 | { | |
c70eba74 | 1374 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1375 | } |
1376 | ||
1377 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1378 | struct ip_mc_list *im) | |
1379 | { | |
1380 | struct ip_mc_list __rcu **mc_hash; | |
1381 | u32 hash; | |
1382 | ||
1383 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1384 | if (mc_hash) { | |
1385 | hash = ip_mc_hash(im); | |
c70eba74 | 1386 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1387 | rcu_assign_pointer(mc_hash[hash], im); |
1388 | return; | |
1389 | } | |
1390 | ||
1391 | /* do not use a hash table for small number of items */ | |
1392 | if (in_dev->mc_count < 4) | |
1393 | return; | |
1394 | ||
1395 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1396 | GFP_KERNEL); | |
1397 | if (!mc_hash) | |
1398 | return; | |
1399 | ||
1400 | for_each_pmc_rtnl(in_dev, im) { | |
1401 | hash = ip_mc_hash(im); | |
c70eba74 | 1402 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1403 | RCU_INIT_POINTER(mc_hash[hash], im); |
1404 | } | |
1405 | ||
1406 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1407 | } | |
1408 | ||
1409 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1410 | struct ip_mc_list *im) | |
1411 | { | |
1412 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1413 | struct ip_mc_list *aux; | |
1414 | ||
1415 | if (!mc_hash) | |
1416 | return; | |
1417 | mc_hash += ip_mc_hash(im); | |
1418 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1419 | mc_hash = &aux->next_hash; | |
1420 | *mc_hash = im->next_hash; | |
1421 | } | |
1422 | ||
1da177e4 LT |
1423 | |
1424 | /* | |
1425 | * A socket has joined a multicast group on device dev. | |
1426 | */ | |
9fb20801 FF |
1427 | static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr, |
1428 | unsigned int mode, gfp_t gfp) | |
1da177e4 LT |
1429 | { |
1430 | struct ip_mc_list *im; | |
1431 | ||
1432 | ASSERT_RTNL(); | |
1433 | ||
1d7138de | 1434 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1435 | if (im->multiaddr == addr) { |
1436 | im->users++; | |
6e2059b5 | 1437 | ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0); |
1da177e4 LT |
1438 | goto out; |
1439 | } | |
1440 | } | |
1441 | ||
9fb20801 | 1442 | im = kzalloc(sizeof(*im), gfp); |
1da177e4 LT |
1443 | if (!im) |
1444 | goto out; | |
1445 | ||
a7e9ff73 JK |
1446 | im->users = 1; |
1447 | im->interface = in_dev; | |
1da177e4 | 1448 | in_dev_hold(in_dev); |
a7e9ff73 | 1449 | im->multiaddr = addr; |
1da177e4 | 1450 | /* initial mode is (EX, empty) */ |
6e2059b5 HL |
1451 | im->sfmode = mode; |
1452 | im->sfcount[mode] = 1; | |
8851ab52 | 1453 | refcount_set(&im->refcnt, 1); |
1da177e4 LT |
1454 | spin_lock_init(&im->lock); |
1455 | #ifdef CONFIG_IP_MULTICAST | |
e99e88a9 | 1456 | timer_setup(&im->timer, igmp_timer_expire, 0); |
1da177e4 | 1457 | #endif |
1d7138de ED |
1458 | |
1459 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1460 | in_dev->mc_count++; |
cf778b00 | 1461 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1462 | |
e9897071 ED |
1463 | ip_mc_hash_add(in_dev, im); |
1464 | ||
1da177e4 | 1465 | #ifdef CONFIG_IP_MULTICAST |
24803f38 | 1466 | igmpv3_del_delrec(in_dev, im); |
1da177e4 | 1467 | #endif |
0ae0d60a | 1468 | igmp_group_added(im); |
1da177e4 LT |
1469 | if (!in_dev->dead) |
1470 | ip_rt_multicast_event(in_dev); | |
1471 | out: | |
1472 | return; | |
1473 | } | |
6e2059b5 | 1474 | |
9fb20801 FF |
1475 | void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) |
1476 | { | |
1477 | ____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp); | |
1478 | } | |
1479 | EXPORT_SYMBOL(__ip_mc_inc_group); | |
1480 | ||
6e2059b5 HL |
1481 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1482 | { | |
a1c4cd67 | 1483 | __ip_mc_inc_group(in_dev, addr, GFP_KERNEL); |
6e2059b5 | 1484 | } |
4bc2f18b | 1485 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1486 | |
9afd85c9 LL |
1487 | static int ip_mc_check_iphdr(struct sk_buff *skb) |
1488 | { | |
1489 | const struct iphdr *iph; | |
1490 | unsigned int len; | |
1491 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1492 | ||
1493 | if (!pskb_may_pull(skb, offset)) | |
1494 | return -EINVAL; | |
1495 | ||
1496 | iph = ip_hdr(skb); | |
1497 | ||
1498 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1499 | return -EINVAL; | |
1500 | ||
1501 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1502 | ||
1503 | if (!pskb_may_pull(skb, offset)) | |
1504 | return -EINVAL; | |
1505 | ||
1506 | iph = ip_hdr(skb); | |
1507 | ||
1508 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1509 | return -EINVAL; | |
1510 | ||
1511 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1512 | if (skb->len < len || len < offset) | |
1513 | return -EINVAL; | |
1514 | ||
1515 | skb_set_transport_header(skb, offset); | |
1516 | ||
1517 | return 0; | |
1518 | } | |
1519 | ||
1520 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1521 | { | |
1522 | unsigned int len = skb_transport_offset(skb); | |
1523 | ||
1524 | len += sizeof(struct igmpv3_report); | |
1525 | ||
a2e2ca3b | 1526 | return ip_mc_may_pull(skb, len) ? 0 : -EINVAL; |
9afd85c9 LL |
1527 | } |
1528 | ||
1529 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1530 | { | |
a2e2ca3b LL |
1531 | unsigned int transport_len = ip_transport_len(skb); |
1532 | unsigned int len; | |
9afd85c9 LL |
1533 | |
1534 | /* IGMPv{1,2}? */ | |
a2e2ca3b | 1535 | if (transport_len != sizeof(struct igmphdr)) { |
9afd85c9 | 1536 | /* or IGMPv3? */ |
a2e2ca3b LL |
1537 | if (transport_len < sizeof(struct igmpv3_query)) |
1538 | return -EINVAL; | |
1539 | ||
1540 | len = skb_transport_offset(skb) + sizeof(struct igmpv3_query); | |
1541 | if (!ip_mc_may_pull(skb, len)) | |
9afd85c9 LL |
1542 | return -EINVAL; |
1543 | } | |
1544 | ||
1545 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1546 | * all-systems destination addresses (224.0.0.1) for general queries | |
1547 | */ | |
1548 | if (!igmp_hdr(skb)->group && | |
1549 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1550 | return -EINVAL; | |
1551 | ||
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1556 | { | |
1557 | switch (igmp_hdr(skb)->type) { | |
1558 | case IGMP_HOST_LEAVE_MESSAGE: | |
1559 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1560 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
9afd85c9 LL |
1561 | return 0; |
1562 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1563 | return ip_mc_check_igmp_reportv3(skb); | |
1564 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1565 | return ip_mc_check_igmp_query(skb); | |
1566 | default: | |
1567 | return -ENOMSG; | |
1568 | } | |
1569 | } | |
1570 | ||
5a43f697 | 1571 | static __sum16 ip_mc_validate_checksum(struct sk_buff *skb) |
9afd85c9 LL |
1572 | { |
1573 | return skb_checksum_simple_validate(skb); | |
1574 | } | |
1575 | ||
a2e2ca3b | 1576 | static int ip_mc_check_igmp_csum(struct sk_buff *skb) |
9afd85c9 | 1577 | { |
9afd85c9 | 1578 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); |
a2e2ca3b LL |
1579 | unsigned int transport_len = ip_transport_len(skb); |
1580 | struct sk_buff *skb_chk; | |
9afd85c9 | 1581 | |
a2e2ca3b LL |
1582 | if (!ip_mc_may_pull(skb, len)) |
1583 | return -EINVAL; | |
9afd85c9 | 1584 | |
9afd85c9 LL |
1585 | skb_chk = skb_checksum_trimmed(skb, transport_len, |
1586 | ip_mc_validate_checksum); | |
1587 | if (!skb_chk) | |
a2e2ca3b | 1588 | return -EINVAL; |
a516993f | 1589 | |
a2e2ca3b | 1590 | if (skb_chk != skb) |
a516993f LL |
1591 | kfree_skb(skb_chk); |
1592 | ||
a2e2ca3b | 1593 | return 0; |
9afd85c9 LL |
1594 | } |
1595 | ||
1596 | /** | |
1597 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1598 | * @skb: the skb to validate | |
9afd85c9 LL |
1599 | * |
1600 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
a516993f | 1601 | * skb transport header accordingly and returns zero. |
9afd85c9 LL |
1602 | * |
1603 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1604 | * standard | |
1605 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1606 | * -ENOMEM: A memory allocation failure happened. | |
1607 | * | |
a516993f LL |
1608 | * Caller needs to set the skb network header and free any returned skb if it |
1609 | * differs from the provided skb. | |
9afd85c9 | 1610 | */ |
ba5ea614 | 1611 | int ip_mc_check_igmp(struct sk_buff *skb) |
9afd85c9 LL |
1612 | { |
1613 | int ret = ip_mc_check_iphdr(skb); | |
1614 | ||
1615 | if (ret < 0) | |
1616 | return ret; | |
1617 | ||
1618 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1619 | return -ENOMSG; | |
1620 | ||
a2e2ca3b LL |
1621 | ret = ip_mc_check_igmp_csum(skb); |
1622 | if (ret < 0) | |
1623 | return ret; | |
1624 | ||
1625 | return ip_mc_check_igmp_msg(skb); | |
9afd85c9 LL |
1626 | } |
1627 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1628 | ||
a816c7c7 | 1629 | /* |
4aa5dee4 | 1630 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1631 | */ |
4aa5dee4 | 1632 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1633 | { |
08882669 | 1634 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1635 | struct ip_mc_list *im; |
1636 | int type; | |
87a8a2ae | 1637 | struct net *net = dev_net(in_dev->dev); |
a816c7c7 | 1638 | |
4aa5dee4 JP |
1639 | ASSERT_RTNL(); |
1640 | ||
1641 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1642 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1643 | continue; | |
df2cf4a7 | 1644 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1645 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1646 | continue; |
a816c7c7 | 1647 | |
866f3b25 ED |
1648 | /* a failover is happening and switches |
1649 | * must be notified immediately | |
1650 | */ | |
1651 | if (IGMP_V1_SEEN(in_dev)) | |
1652 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1653 | else if (IGMP_V2_SEEN(in_dev)) | |
1654 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1655 | else | |
1656 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1657 | igmp_send_report(in_dev, im, type); | |
1658 | } | |
a816c7c7 JV |
1659 | #endif |
1660 | } | |
1661 | ||
1da177e4 LT |
1662 | /* |
1663 | * A socket has left a multicast group on device dev | |
1664 | */ | |
1665 | ||
9fb20801 | 1666 | void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) |
1da177e4 | 1667 | { |
1d7138de ED |
1668 | struct ip_mc_list *i; |
1669 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1670 | |
1da177e4 | 1671 | ASSERT_RTNL(); |
e905a9ed | 1672 | |
1d7138de ED |
1673 | for (ip = &in_dev->mc_list; |
1674 | (i = rtnl_dereference(*ip)) != NULL; | |
1675 | ip = &i->next_rcu) { | |
a7e9ff73 | 1676 | if (i->multiaddr == addr) { |
1da177e4 | 1677 | if (--i->users == 0) { |
e9897071 | 1678 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1679 | *ip = i->next_rcu; |
b8bae41e | 1680 | in_dev->mc_count--; |
9fb20801 | 1681 | __igmp_group_dropped(i, gfp); |
24cf3af3 | 1682 | ip_mc_clear_src(i); |
1da177e4 LT |
1683 | |
1684 | if (!in_dev->dead) | |
1685 | ip_rt_multicast_event(in_dev); | |
1686 | ||
1687 | ip_ma_put(i); | |
1688 | return; | |
1689 | } | |
1690 | break; | |
1691 | } | |
1692 | } | |
1693 | } | |
9fb20801 | 1694 | EXPORT_SYMBOL(__ip_mc_dec_group); |
1da177e4 | 1695 | |
75c78500 MS |
1696 | /* Device changing type */ |
1697 | ||
1698 | void ip_mc_unmap(struct in_device *in_dev) | |
1699 | { | |
1d7138de | 1700 | struct ip_mc_list *pmc; |
75c78500 MS |
1701 | |
1702 | ASSERT_RTNL(); | |
1703 | ||
1d7138de ED |
1704 | for_each_pmc_rtnl(in_dev, pmc) |
1705 | igmp_group_dropped(pmc); | |
75c78500 MS |
1706 | } |
1707 | ||
1708 | void ip_mc_remap(struct in_device *in_dev) | |
1709 | { | |
1d7138de | 1710 | struct ip_mc_list *pmc; |
75c78500 MS |
1711 | |
1712 | ASSERT_RTNL(); | |
1713 | ||
24803f38 HL |
1714 | for_each_pmc_rtnl(in_dev, pmc) { |
1715 | #ifdef CONFIG_IP_MULTICAST | |
1716 | igmpv3_del_delrec(in_dev, pmc); | |
1717 | #endif | |
0ae0d60a | 1718 | igmp_group_added(pmc); |
24803f38 | 1719 | } |
75c78500 MS |
1720 | } |
1721 | ||
1da177e4 LT |
1722 | /* Device going down */ |
1723 | ||
1724 | void ip_mc_down(struct in_device *in_dev) | |
1725 | { | |
1d7138de | 1726 | struct ip_mc_list *pmc; |
1da177e4 LT |
1727 | |
1728 | ASSERT_RTNL(); | |
1729 | ||
1d7138de ED |
1730 | for_each_pmc_rtnl(in_dev, pmc) |
1731 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1732 | |
1733 | #ifdef CONFIG_IP_MULTICAST | |
4a2b285e | 1734 | WRITE_ONCE(in_dev->mr_ifc_count, 0); |
1da177e4 LT |
1735 | if (del_timer(&in_dev->mr_ifc_timer)) |
1736 | __in_dev_put(in_dev); | |
1737 | in_dev->mr_gq_running = 0; | |
1738 | if (del_timer(&in_dev->mr_gq_timer)) | |
1739 | __in_dev_put(in_dev); | |
1da177e4 LT |
1740 | #endif |
1741 | ||
1742 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1743 | } | |
1744 | ||
dcd87999 | 1745 | #ifdef CONFIG_IP_MULTICAST |
966c37f2 HL |
1746 | static void ip_mc_reset(struct in_device *in_dev) |
1747 | { | |
165094af | 1748 | struct net *net = dev_net(in_dev->dev); |
966c37f2 HL |
1749 | |
1750 | in_dev->mr_qi = IGMP_QUERY_INTERVAL; | |
1751 | in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL; | |
1752 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; | |
1753 | } | |
1754 | #else | |
1755 | static void ip_mc_reset(struct in_device *in_dev) | |
1756 | { | |
1757 | } | |
dcd87999 | 1758 | #endif |
966c37f2 HL |
1759 | |
1760 | void ip_mc_init_dev(struct in_device *in_dev) | |
1761 | { | |
1da177e4 LT |
1762 | ASSERT_RTNL(); |
1763 | ||
1da177e4 | 1764 | #ifdef CONFIG_IP_MULTICAST |
e99e88a9 KC |
1765 | timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0); |
1766 | timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0); | |
1da177e4 | 1767 | #endif |
966c37f2 | 1768 | ip_mc_reset(in_dev); |
1da177e4 | 1769 | |
1da177e4 LT |
1770 | spin_lock_init(&in_dev->mc_tomb_lock); |
1771 | } | |
1772 | ||
1773 | /* Device going up */ | |
1774 | ||
1775 | void ip_mc_up(struct in_device *in_dev) | |
1776 | { | |
1d7138de | 1777 | struct ip_mc_list *pmc; |
1da177e4 LT |
1778 | |
1779 | ASSERT_RTNL(); | |
1780 | ||
966c37f2 | 1781 | ip_mc_reset(in_dev); |
1da177e4 LT |
1782 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1783 | ||
24803f38 HL |
1784 | for_each_pmc_rtnl(in_dev, pmc) { |
1785 | #ifdef CONFIG_IP_MULTICAST | |
1786 | igmpv3_del_delrec(in_dev, pmc); | |
1787 | #endif | |
0ae0d60a | 1788 | igmp_group_added(pmc); |
24803f38 | 1789 | } |
1da177e4 LT |
1790 | } |
1791 | ||
1792 | /* | |
1793 | * Device is about to be destroyed: clean up. | |
1794 | */ | |
1795 | ||
1796 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1797 | { | |
1798 | struct ip_mc_list *i; | |
1799 | ||
1800 | ASSERT_RTNL(); | |
1801 | ||
1802 | /* Deactivate timers */ | |
1803 | ip_mc_down(in_dev); | |
24803f38 HL |
1804 | #ifdef CONFIG_IP_MULTICAST |
1805 | igmpv3_clear_delrec(in_dev); | |
1806 | #endif | |
1da177e4 | 1807 | |
1d7138de ED |
1808 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1809 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1810 | in_dev->mc_count--; |
d8e29730 | 1811 | ip_mc_clear_src(i); |
1da177e4 | 1812 | ip_ma_put(i); |
1da177e4 | 1813 | } |
1da177e4 LT |
1814 | } |
1815 | ||
9e917dca | 1816 | /* RTNL is locked */ |
877acedc | 1817 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1818 | { |
1da177e4 LT |
1819 | struct net_device *dev = NULL; |
1820 | struct in_device *idev = NULL; | |
1821 | ||
1822 | if (imr->imr_ifindex) { | |
877acedc | 1823 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1824 | return idev; |
1825 | } | |
1826 | if (imr->imr_address.s_addr) { | |
9e917dca | 1827 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1828 | if (!dev) |
1829 | return NULL; | |
1da177e4 LT |
1830 | } |
1831 | ||
b23dd4fe | 1832 | if (!dev) { |
78fbfd8a DM |
1833 | struct rtable *rt = ip_route_output(net, |
1834 | imr->imr_multiaddr.s_addr, | |
1835 | 0, 0, 0); | |
b23dd4fe DM |
1836 | if (!IS_ERR(rt)) { |
1837 | dev = rt->dst.dev; | |
1838 | ip_rt_put(rt); | |
1839 | } | |
1da177e4 LT |
1840 | } |
1841 | if (dev) { | |
1842 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1843 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1844 | } |
1845 | return idev; | |
1846 | } | |
1847 | ||
1848 | /* | |
1849 | * Join a socket to a group | |
1850 | */ | |
1da177e4 LT |
1851 | |
1852 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1853 | __be32 *psfsrc) |
1da177e4 LT |
1854 | { |
1855 | struct ip_sf_list *psf, *psf_prev; | |
1856 | int rv = 0; | |
1857 | ||
1858 | psf_prev = NULL; | |
c71151f0 | 1859 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1860 | if (psf->sf_inaddr == *psfsrc) |
1861 | break; | |
1862 | psf_prev = psf; | |
1863 | } | |
1864 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1865 | /* source filter not found, or count wrong => bug */ | |
1866 | return -ESRCH; | |
1867 | } | |
1868 | psf->sf_count[sfmode]--; | |
1869 | if (psf->sf_count[sfmode] == 0) { | |
1870 | ip_rt_multicast_event(pmc->interface); | |
1871 | } | |
1872 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1873 | #ifdef CONFIG_IP_MULTICAST | |
1874 | struct in_device *in_dev = pmc->interface; | |
165094af | 1875 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1876 | #endif |
1877 | ||
1878 | /* no more filters for this source */ | |
1879 | if (psf_prev) | |
1880 | psf_prev->sf_next = psf->sf_next; | |
1881 | else | |
1882 | pmc->sources = psf->sf_next; | |
1883 | #ifdef CONFIG_IP_MULTICAST | |
1884 | if (psf->sf_oldin && | |
1885 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
165094af | 1886 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1887 | psf->sf_next = pmc->tomb; |
1888 | pmc->tomb = psf; | |
1889 | rv = 1; | |
1890 | } else | |
1891 | #endif | |
1892 | kfree(psf); | |
1893 | } | |
1894 | return rv; | |
1895 | } | |
1896 | ||
1897 | #ifndef CONFIG_IP_MULTICAST | |
1898 | #define igmp_ifc_event(x) do { } while (0) | |
1899 | #endif | |
1900 | ||
8f935bbd AV |
1901 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1902 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1903 | { |
1904 | struct ip_mc_list *pmc; | |
1905 | int changerec = 0; | |
1906 | int i, err; | |
1907 | ||
1908 | if (!in_dev) | |
1909 | return -ENODEV; | |
1d7138de ED |
1910 | rcu_read_lock(); |
1911 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1912 | if (*pmca == pmc->multiaddr) |
1913 | break; | |
1914 | } | |
1915 | if (!pmc) { | |
1916 | /* MCA not found?? bug */ | |
1d7138de | 1917 | rcu_read_unlock(); |
1da177e4 LT |
1918 | return -ESRCH; |
1919 | } | |
1920 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1921 | rcu_read_unlock(); |
1da177e4 LT |
1922 | #ifdef CONFIG_IP_MULTICAST |
1923 | sf_markstate(pmc); | |
1924 | #endif | |
1925 | if (!delta) { | |
1926 | err = -EINVAL; | |
1927 | if (!pmc->sfcount[sfmode]) | |
1928 | goto out_unlock; | |
1929 | pmc->sfcount[sfmode]--; | |
1930 | } | |
1931 | err = 0; | |
c71151f0 | 1932 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
1933 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
1934 | ||
1935 | changerec |= rv > 0; | |
1936 | if (!err && rv < 0) | |
1937 | err = rv; | |
1938 | } | |
1939 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1940 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1941 | pmc->sfcount[MCAST_INCLUDE]) { | |
1942 | #ifdef CONFIG_IP_MULTICAST | |
1943 | struct ip_sf_list *psf; | |
165094af | 1944 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1945 | #endif |
1946 | ||
1947 | /* filter mode change */ | |
1948 | pmc->sfmode = MCAST_INCLUDE; | |
1949 | #ifdef CONFIG_IP_MULTICAST | |
165094af | 1950 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
4a2b285e | 1951 | WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount); |
c71151f0 | 1952 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1953 | psf->sf_crcount = 0; |
1954 | igmp_ifc_event(pmc->interface); | |
1955 | } else if (sf_setstate(pmc) || changerec) { | |
1956 | igmp_ifc_event(pmc->interface); | |
1957 | #endif | |
1958 | } | |
1959 | out_unlock: | |
1960 | spin_unlock_bh(&pmc->lock); | |
1961 | return err; | |
1962 | } | |
1963 | ||
1964 | /* | |
1965 | * Add multicast single-source filter to the interface list | |
1966 | */ | |
1967 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1968 | __be32 *psfsrc) |
1da177e4 LT |
1969 | { |
1970 | struct ip_sf_list *psf, *psf_prev; | |
1971 | ||
1972 | psf_prev = NULL; | |
c71151f0 | 1973 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1974 | if (psf->sf_inaddr == *psfsrc) |
1975 | break; | |
1976 | psf_prev = psf; | |
1977 | } | |
1978 | if (!psf) { | |
0da974f4 | 1979 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1980 | if (!psf) |
1981 | return -ENOBUFS; | |
1da177e4 LT |
1982 | psf->sf_inaddr = *psfsrc; |
1983 | if (psf_prev) { | |
1984 | psf_prev->sf_next = psf; | |
1985 | } else | |
1986 | pmc->sources = psf; | |
1987 | } | |
1988 | psf->sf_count[sfmode]++; | |
1989 | if (psf->sf_count[sfmode] == 1) { | |
1990 | ip_rt_multicast_event(pmc->interface); | |
1991 | } | |
1992 | return 0; | |
1993 | } | |
1994 | ||
1995 | #ifdef CONFIG_IP_MULTICAST | |
1996 | static void sf_markstate(struct ip_mc_list *pmc) | |
1997 | { | |
1998 | struct ip_sf_list *psf; | |
1999 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
2000 | ||
c71151f0 | 2001 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2002 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
2003 | psf->sf_oldin = mca_xcount == | |
2004 | psf->sf_count[MCAST_EXCLUDE] && | |
2005 | !psf->sf_count[MCAST_INCLUDE]; | |
2006 | } else | |
2007 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
2008 | } | |
2009 | ||
2010 | static int sf_setstate(struct ip_mc_list *pmc) | |
2011 | { | |
ad12583f | 2012 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
2013 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
2014 | int qrv = pmc->interface->mr_qrv; | |
2015 | int new_in, rv; | |
2016 | ||
2017 | rv = 0; | |
c71151f0 | 2018 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2019 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
2020 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
2021 | !psf->sf_count[MCAST_INCLUDE]; | |
2022 | } else | |
2023 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
2024 | if (new_in) { |
2025 | if (!psf->sf_oldin) { | |
76edc605 | 2026 | struct ip_sf_list *prev = NULL; |
ad12583f | 2027 | |
c71151f0 | 2028 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
2029 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
2030 | break; | |
2031 | prev = dpsf; | |
2032 | } | |
2033 | if (dpsf) { | |
2034 | if (prev) | |
2035 | prev->sf_next = dpsf->sf_next; | |
2036 | else | |
2037 | pmc->tomb = dpsf->sf_next; | |
2038 | kfree(dpsf); | |
2039 | } | |
2040 | psf->sf_crcount = qrv; | |
2041 | rv++; | |
2042 | } | |
2043 | } else if (psf->sf_oldin) { | |
2044 | ||
2045 | psf->sf_crcount = 0; | |
2046 | /* | |
2047 | * add or update "delete" records if an active filter | |
2048 | * is now inactive | |
2049 | */ | |
c71151f0 | 2050 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
2051 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
2052 | break; | |
2053 | if (!dpsf) { | |
3ed37a6f | 2054 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
2055 | if (!dpsf) |
2056 | continue; | |
2057 | *dpsf = *psf; | |
2058 | /* pmc->lock held by callers */ | |
2059 | dpsf->sf_next = pmc->tomb; | |
2060 | pmc->tomb = dpsf; | |
2061 | } | |
2062 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
2063 | rv++; |
2064 | } | |
2065 | } | |
2066 | return rv; | |
2067 | } | |
2068 | #endif | |
2069 | ||
2070 | /* | |
2071 | * Add multicast source filter list to the interface list | |
2072 | */ | |
8f935bbd AV |
2073 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
2074 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
2075 | { |
2076 | struct ip_mc_list *pmc; | |
2077 | int isexclude; | |
2078 | int i, err; | |
2079 | ||
2080 | if (!in_dev) | |
2081 | return -ENODEV; | |
1d7138de ED |
2082 | rcu_read_lock(); |
2083 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
2084 | if (*pmca == pmc->multiaddr) |
2085 | break; | |
2086 | } | |
2087 | if (!pmc) { | |
2088 | /* MCA not found?? bug */ | |
1d7138de | 2089 | rcu_read_unlock(); |
1da177e4 LT |
2090 | return -ESRCH; |
2091 | } | |
2092 | spin_lock_bh(&pmc->lock); | |
1d7138de | 2093 | rcu_read_unlock(); |
1da177e4 LT |
2094 | |
2095 | #ifdef CONFIG_IP_MULTICAST | |
2096 | sf_markstate(pmc); | |
2097 | #endif | |
2098 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
2099 | if (!delta) | |
2100 | pmc->sfcount[sfmode]++; | |
2101 | err = 0; | |
c71151f0 | 2102 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 2103 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
2104 | if (err) |
2105 | break; | |
2106 | } | |
2107 | if (err) { | |
2108 | int j; | |
2109 | ||
685f94e6 JZ |
2110 | if (!delta) |
2111 | pmc->sfcount[sfmode]--; | |
c71151f0 | 2112 | for (j = 0; j < i; j++) |
a1889c0d | 2113 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
2114 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
2115 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 2116 | struct ip_sf_list *psf; |
165094af | 2117 | struct net *net = dev_net(pmc->interface->dev); |
cfcabdcc | 2118 | in_dev = pmc->interface; |
1da177e4 LT |
2119 | #endif |
2120 | ||
2121 | /* filter mode change */ | |
2122 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
2123 | pmc->sfmode = MCAST_EXCLUDE; | |
2124 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
2125 | pmc->sfmode = MCAST_INCLUDE; | |
2126 | #ifdef CONFIG_IP_MULTICAST | |
2127 | /* else no filters; keep old mode for reports */ | |
2128 | ||
165094af | 2129 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
4a2b285e | 2130 | WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount); |
c71151f0 | 2131 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2132 | psf->sf_crcount = 0; |
2133 | igmp_ifc_event(in_dev); | |
2134 | } else if (sf_setstate(pmc)) { | |
2135 | igmp_ifc_event(in_dev); | |
2136 | #endif | |
2137 | } | |
2138 | spin_unlock_bh(&pmc->lock); | |
2139 | return err; | |
2140 | } | |
2141 | ||
2142 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
2143 | { | |
3580d04a | 2144 | struct ip_sf_list *tomb, *sources; |
1da177e4 | 2145 | |
c38b7d32 WC |
2146 | spin_lock_bh(&pmc->lock); |
2147 | tomb = pmc->tomb; | |
2148 | pmc->tomb = NULL; | |
2149 | sources = pmc->sources; | |
2150 | pmc->sources = NULL; | |
2151 | pmc->sfmode = MCAST_EXCLUDE; | |
2152 | pmc->sfcount[MCAST_INCLUDE] = 0; | |
2153 | pmc->sfcount[MCAST_EXCLUDE] = 1; | |
2154 | spin_unlock_bh(&pmc->lock); | |
2155 | ||
3580d04a ED |
2156 | ip_sf_list_clear_all(tomb); |
2157 | ip_sf_list_clear_all(sources); | |
1da177e4 LT |
2158 | } |
2159 | ||
54ff9ef3 MRL |
2160 | /* Join a multicast group |
2161 | */ | |
6e2059b5 HL |
2162 | static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr, |
2163 | unsigned int mode) | |
1da177e4 | 2164 | { |
8f935bbd | 2165 | __be32 addr = imr->imr_multiaddr.s_addr; |
959d10f6 | 2166 | struct ip_mc_socklist *iml, *i; |
1da177e4 LT |
2167 | struct in_device *in_dev; |
2168 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 2169 | struct net *net = sock_net(sk); |
ca9b907d | 2170 | int ifindex; |
1da177e4 | 2171 | int count = 0; |
959d10f6 ED |
2172 | int err; |
2173 | ||
2174 | ASSERT_RTNL(); | |
1da177e4 | 2175 | |
f97c1e0c | 2176 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2177 | return -EINVAL; |
2178 | ||
877acedc | 2179 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
2180 | |
2181 | if (!in_dev) { | |
1da177e4 LT |
2182 | err = -ENODEV; |
2183 | goto done; | |
2184 | } | |
2185 | ||
1da177e4 | 2186 | err = -EADDRINUSE; |
ca9b907d | 2187 | ifindex = imr->imr_ifindex; |
1d7138de | 2188 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
2189 | if (i->multi.imr_multiaddr.s_addr == addr && |
2190 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 2191 | goto done; |
1da177e4 LT |
2192 | count++; |
2193 | } | |
2194 | err = -ENOBUFS; | |
815c5270 | 2195 | if (count >= net->ipv4.sysctl_igmp_max_memberships) |
ca9b907d | 2196 | goto done; |
a7e9ff73 | 2197 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
51456b29 | 2198 | if (!iml) |
1da177e4 | 2199 | goto done; |
ca9b907d | 2200 | |
1da177e4 | 2201 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 2202 | iml->next_rcu = inet->mc_list; |
1da177e4 | 2203 | iml->sflist = NULL; |
6e2059b5 | 2204 | iml->sfmode = mode; |
cf778b00 | 2205 | rcu_assign_pointer(inet->mc_list, iml); |
a1c4cd67 | 2206 | ____ip_mc_inc_group(in_dev, addr, mode, GFP_KERNEL); |
1da177e4 | 2207 | err = 0; |
1da177e4 | 2208 | done: |
1da177e4 LT |
2209 | return err; |
2210 | } | |
6e2059b5 HL |
2211 | |
2212 | /* Join ASM (Any-Source Multicast) group | |
2213 | */ | |
2214 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
2215 | { | |
2216 | return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE); | |
2217 | } | |
4bc2f18b | 2218 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 | 2219 | |
6e2059b5 HL |
2220 | /* Join SSM (Source-Specific Multicast) group |
2221 | */ | |
2222 | int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, | |
2223 | unsigned int mode) | |
2224 | { | |
2225 | return __ip_mc_join_group(sk, imr, mode); | |
2226 | } | |
2227 | ||
1da177e4 LT |
2228 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, |
2229 | struct in_device *in_dev) | |
2230 | { | |
1d7138de | 2231 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
2232 | int err; |
2233 | ||
51456b29 | 2234 | if (!psf) { |
1da177e4 LT |
2235 | /* any-source empty exclude case */ |
2236 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2237 | iml->sfmode, 0, NULL, 0); | |
2238 | } | |
2239 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 2240 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 2241 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e | 2242 | /* decrease mem now to avoid the memleak warning */ |
e6a1f7e0 | 2243 | atomic_sub(struct_size(psf, sl_addr, psf->sl_max), &sk->sk_omem_alloc); |
7519cce4 | 2244 | kfree_rcu(psf, rcu); |
1da177e4 LT |
2245 | return err; |
2246 | } | |
2247 | ||
54ff9ef3 | 2248 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
1da177e4 LT |
2249 | { |
2250 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
2251 | struct ip_mc_socklist *iml; |
2252 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 2253 | struct in_device *in_dev; |
877acedc | 2254 | struct net *net = sock_net(sk); |
8f935bbd | 2255 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 2256 | u32 ifindex; |
acd6e00b | 2257 | int ret = -EADDRNOTAVAIL; |
1da177e4 | 2258 | |
959d10f6 ED |
2259 | ASSERT_RTNL(); |
2260 | ||
877acedc | 2261 | in_dev = ip_mc_find_dev(net, imr); |
4eba7bb1 | 2262 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
52ad353a | 2263 | ret = -ENODEV; |
2264 | goto out; | |
2265 | } | |
84b42bae | 2266 | ifindex = imr->imr_ifindex; |
1d7138de ED |
2267 | for (imlp = &inet->mc_list; |
2268 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2269 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
2270 | if (iml->multi.imr_multiaddr.s_addr != group) |
2271 | continue; | |
2272 | if (ifindex) { | |
2273 | if (iml->multi.imr_ifindex != ifindex) | |
2274 | continue; | |
2275 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2276 | iml->multi.imr_address.s_addr) | |
2277 | continue; | |
1da177e4 | 2278 | |
acd6e00b | 2279 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 2280 | |
1d7138de | 2281 | *imlp = iml->next_rcu; |
acd6e00b | 2282 | |
4eba7bb1 AL |
2283 | if (in_dev) |
2284 | ip_mc_dec_group(in_dev, group); | |
959d10f6 | 2285 | |
c85bb41e FL |
2286 | /* decrease mem now to avoid the memleak warning */ |
2287 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2288 | kfree_rcu(iml, rcu); |
acd6e00b | 2289 | return 0; |
1da177e4 | 2290 | } |
52ad353a | 2291 | out: |
959d10f6 ED |
2292 | return ret; |
2293 | } | |
193ba924 | 2294 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
2295 | |
2296 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2297 | ip_mreq_source *mreqs, int ifindex) | |
2298 | { | |
2299 | int err; | |
2300 | struct ip_mreqn imr; | |
63007727 | 2301 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
2302 | struct ip_mc_socklist *pmc; |
2303 | struct in_device *in_dev = NULL; | |
2304 | struct inet_sock *inet = inet_sk(sk); | |
2305 | struct ip_sf_socklist *psl; | |
877acedc | 2306 | struct net *net = sock_net(sk); |
8cdaaa15 | 2307 | int leavegroup = 0; |
1da177e4 LT |
2308 | int i, j, rv; |
2309 | ||
f97c1e0c | 2310 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2311 | return -EINVAL; |
2312 | ||
54ff9ef3 | 2313 | ASSERT_RTNL(); |
1da177e4 LT |
2314 | |
2315 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2316 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2317 | imr.imr_ifindex = ifindex; | |
877acedc | 2318 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2319 | |
2320 | if (!in_dev) { | |
2321 | err = -ENODEV; | |
2322 | goto done; | |
2323 | } | |
2324 | err = -EADDRNOTAVAIL; | |
2325 | ||
1d7138de | 2326 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2327 | if ((pmc->multi.imr_multiaddr.s_addr == |
2328 | imr.imr_multiaddr.s_addr) && | |
2329 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2330 | break; |
2331 | } | |
917f2f10 DS |
2332 | if (!pmc) { /* must have a prior join */ |
2333 | err = -EINVAL; | |
1da177e4 | 2334 | goto done; |
917f2f10 | 2335 | } |
1da177e4 LT |
2336 | /* if a source filter was set, must be the same mode as before */ |
2337 | if (pmc->sflist) { | |
917f2f10 DS |
2338 | if (pmc->sfmode != omode) { |
2339 | err = -EINVAL; | |
1da177e4 | 2340 | goto done; |
917f2f10 | 2341 | } |
1da177e4 LT |
2342 | } else if (pmc->sfmode != omode) { |
2343 | /* allow mode switches for empty-set filters */ | |
2344 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2345 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2346 | NULL, 0); |
2347 | pmc->sfmode = omode; | |
2348 | } | |
2349 | ||
1d7138de | 2350 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2351 | if (!add) { |
2352 | if (!psl) | |
917f2f10 | 2353 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2354 | rv = !0; |
c71151f0 | 2355 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2356 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2357 | sizeof(__be32)); |
1da177e4 LT |
2358 | if (rv == 0) |
2359 | break; | |
2360 | } | |
2361 | if (rv) /* source not found */ | |
917f2f10 | 2362 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2363 | |
8cdaaa15 DS |
2364 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2365 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2366 | leavegroup = 1; | |
2367 | goto done; | |
2368 | } | |
2369 | ||
1da177e4 | 2370 | /* update the interface filter */ |
e905a9ed | 2371 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2372 | &mreqs->imr_sourceaddr, 1); |
2373 | ||
c71151f0 | 2374 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2375 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2376 | psl->sl_count--; | |
2377 | err = 0; | |
2378 | goto done; | |
2379 | } | |
2380 | /* else, add a new source to the filter */ | |
2381 | ||
166b6b2d | 2382 | if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { |
1da177e4 LT |
2383 | err = -ENOBUFS; |
2384 | goto done; | |
2385 | } | |
2386 | if (!psl || psl->sl_count == psl->sl_max) { | |
2387 | struct ip_sf_socklist *newpsl; | |
2388 | int count = IP_SFBLOCK; | |
2389 | ||
2390 | if (psl) | |
2391 | count += psl->sl_max; | |
e6a1f7e0 GS |
2392 | newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count), |
2393 | GFP_KERNEL); | |
1da177e4 LT |
2394 | if (!newpsl) { |
2395 | err = -ENOBUFS; | |
2396 | goto done; | |
2397 | } | |
2398 | newpsl->sl_max = count; | |
2399 | newpsl->sl_count = count - IP_SFBLOCK; | |
2400 | if (psl) { | |
c71151f0 | 2401 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2402 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e | 2403 | /* decrease mem now to avoid the memleak warning */ |
e6a1f7e0 GS |
2404 | atomic_sub(struct_size(psl, sl_addr, psl->sl_max), |
2405 | &sk->sk_omem_alloc); | |
7519cce4 | 2406 | kfree_rcu(psl, rcu); |
1da177e4 | 2407 | } |
cf778b00 | 2408 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2409 | psl = newpsl; |
1da177e4 LT |
2410 | } |
2411 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2412 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2413 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2414 | sizeof(__be32)); |
1da177e4 LT |
2415 | if (rv == 0) |
2416 | break; | |
2417 | } | |
2418 | if (rv == 0) /* address already there is an error */ | |
2419 | goto done; | |
c71151f0 | 2420 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2421 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2422 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2423 | psl->sl_count++; | |
2424 | err = 0; | |
2425 | /* update the interface list */ | |
e905a9ed | 2426 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2427 | &mreqs->imr_sourceaddr, 1); |
2428 | done: | |
8cdaaa15 | 2429 | if (leavegroup) |
54ff9ef3 | 2430 | err = ip_mc_leave_group(sk, &imr); |
1da177e4 LT |
2431 | return err; |
2432 | } | |
2433 | ||
2434 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2435 | { | |
9951f036 | 2436 | int err = 0; |
1da177e4 | 2437 | struct ip_mreqn imr; |
63007727 | 2438 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2439 | struct ip_mc_socklist *pmc; |
2440 | struct in_device *in_dev; | |
2441 | struct inet_sock *inet = inet_sk(sk); | |
2442 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2443 | struct net *net = sock_net(sk); |
9951f036 | 2444 | int leavegroup = 0; |
1da177e4 | 2445 | |
f97c1e0c | 2446 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2447 | return -EINVAL; |
2448 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2449 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2450 | return -EINVAL; | |
2451 | ||
54ff9ef3 | 2452 | ASSERT_RTNL(); |
1da177e4 LT |
2453 | |
2454 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2455 | imr.imr_address.s_addr = msf->imsf_interface; | |
2456 | imr.imr_ifindex = ifindex; | |
877acedc | 2457 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2458 | |
2459 | if (!in_dev) { | |
2460 | err = -ENODEV; | |
2461 | goto done; | |
2462 | } | |
1da177e4 | 2463 | |
9951f036 DS |
2464 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2465 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2466 | leavegroup = 1; | |
2467 | goto done; | |
2468 | } | |
2469 | ||
1d7138de | 2470 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2471 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2472 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2473 | break; | |
2474 | } | |
917f2f10 DS |
2475 | if (!pmc) { /* must have a prior join */ |
2476 | err = -EINVAL; | |
1da177e4 | 2477 | goto done; |
917f2f10 | 2478 | } |
1da177e4 | 2479 | if (msf->imsf_numsrc) { |
e6a1f7e0 GS |
2480 | newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, |
2481 | msf->imsf_numsrc), | |
2482 | GFP_KERNEL); | |
1da177e4 LT |
2483 | if (!newpsl) { |
2484 | err = -ENOBUFS; | |
2485 | goto done; | |
2486 | } | |
2487 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2d3e5caf GS |
2488 | memcpy(newpsl->sl_addr, msf->imsf_slist_flex, |
2489 | flex_array_size(msf, imsf_slist_flex, msf->imsf_numsrc)); | |
1da177e4 LT |
2490 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2491 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2492 | if (err) { | |
e6a1f7e0 GS |
2493 | sock_kfree_s(sk, newpsl, |
2494 | struct_size(newpsl, sl_addr, | |
2495 | newpsl->sl_max)); | |
1da177e4 LT |
2496 | goto done; |
2497 | } | |
8713dbf0 | 2498 | } else { |
1da177e4 | 2499 | newpsl = NULL; |
8713dbf0 YZ |
2500 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2501 | msf->imsf_fmode, 0, NULL, 0); | |
2502 | } | |
1d7138de | 2503 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2504 | if (psl) { |
2505 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2506 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e | 2507 | /* decrease mem now to avoid the memleak warning */ |
e6a1f7e0 GS |
2508 | atomic_sub(struct_size(psl, sl_addr, psl->sl_max), |
2509 | &sk->sk_omem_alloc); | |
7519cce4 | 2510 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2511 | } else |
2512 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2513 | 0, NULL, 0); | |
cf778b00 | 2514 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2515 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2516 | err = 0; |
1da177e4 | 2517 | done: |
9951f036 DS |
2518 | if (leavegroup) |
2519 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2520 | return err; |
2521 | } | |
2522 | ||
2523 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2524 | struct ip_msfilter __user *optval, int __user *optlen) | |
2525 | { | |
2526 | int err, len, count, copycount; | |
2527 | struct ip_mreqn imr; | |
63007727 | 2528 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2529 | struct ip_mc_socklist *pmc; |
2530 | struct in_device *in_dev; | |
2531 | struct inet_sock *inet = inet_sk(sk); | |
2532 | struct ip_sf_socklist *psl; | |
877acedc | 2533 | struct net *net = sock_net(sk); |
1da177e4 | 2534 | |
87e9f031 WC |
2535 | ASSERT_RTNL(); |
2536 | ||
f97c1e0c | 2537 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2538 | return -EINVAL; |
2539 | ||
1da177e4 LT |
2540 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
2541 | imr.imr_address.s_addr = msf->imsf_interface; | |
2542 | imr.imr_ifindex = 0; | |
877acedc | 2543 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2544 | |
2545 | if (!in_dev) { | |
2546 | err = -ENODEV; | |
2547 | goto done; | |
2548 | } | |
2549 | err = -EADDRNOTAVAIL; | |
2550 | ||
1d7138de | 2551 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2552 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2553 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2554 | break; | |
2555 | } | |
2556 | if (!pmc) /* must have a prior join */ | |
2557 | goto done; | |
2558 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2559 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2560 | if (!psl) { |
2561 | len = 0; | |
2562 | count = 0; | |
2563 | } else { | |
2564 | count = psl->sl_count; | |
2565 | } | |
2566 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2d3e5caf | 2567 | len = flex_array_size(psl, sl_addr, copycount); |
1da177e4 | 2568 | msf->imsf_numsrc = count; |
4167a960 GS |
2569 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || |
2570 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
1da177e4 LT |
2571 | return -EFAULT; |
2572 | } | |
2573 | if (len && | |
2d3e5caf | 2574 | copy_to_user(&optval->imsf_slist_flex[0], psl->sl_addr, len)) |
1da177e4 LT |
2575 | return -EFAULT; |
2576 | return 0; | |
2577 | done: | |
1da177e4 LT |
2578 | return err; |
2579 | } | |
2580 | ||
2581 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
931ca7ab | 2582 | struct sockaddr_storage __user *p) |
1da177e4 | 2583 | { |
931ca7ab | 2584 | int i, count, copycount; |
1da177e4 | 2585 | struct sockaddr_in *psin; |
63007727 | 2586 | __be32 addr; |
1da177e4 LT |
2587 | struct ip_mc_socklist *pmc; |
2588 | struct inet_sock *inet = inet_sk(sk); | |
2589 | struct ip_sf_socklist *psl; | |
2590 | ||
87e9f031 WC |
2591 | ASSERT_RTNL(); |
2592 | ||
1da177e4 LT |
2593 | psin = (struct sockaddr_in *)&gsf->gf_group; |
2594 | if (psin->sin_family != AF_INET) | |
2595 | return -EINVAL; | |
2596 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2597 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2598 | return -EINVAL; |
2599 | ||
1d7138de | 2600 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2601 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2602 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2603 | break; | |
2604 | } | |
2605 | if (!pmc) /* must have a prior join */ | |
931ca7ab | 2606 | return -EADDRNOTAVAIL; |
1da177e4 | 2607 | gsf->gf_fmode = pmc->sfmode; |
1d7138de | 2608 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2609 | count = psl ? psl->sl_count : 0; |
2610 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2611 | gsf->gf_numsrc = count; | |
931ca7ab | 2612 | for (i = 0; i < copycount; i++, p++) { |
1da177e4 LT |
2613 | struct sockaddr_storage ss; |
2614 | ||
2615 | psin = (struct sockaddr_in *)&ss; | |
2616 | memset(&ss, 0, sizeof(ss)); | |
2617 | psin->sin_family = AF_INET; | |
2618 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
931ca7ab | 2619 | if (copy_to_user(p, &ss, sizeof(ss))) |
1da177e4 LT |
2620 | return -EFAULT; |
2621 | } | |
2622 | return 0; | |
1da177e4 LT |
2623 | } |
2624 | ||
2625 | /* | |
2626 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2627 | */ | |
60d9b031 DA |
2628 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, |
2629 | int dif, int sdif) | |
1da177e4 LT |
2630 | { |
2631 | struct inet_sock *inet = inet_sk(sk); | |
2632 | struct ip_mc_socklist *pmc; | |
2633 | struct ip_sf_socklist *psl; | |
2634 | int i; | |
c85bb41e | 2635 | int ret; |
1da177e4 | 2636 | |
c85bb41e | 2637 | ret = 1; |
f97c1e0c | 2638 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2639 | goto out; |
1da177e4 | 2640 | |
c85bb41e | 2641 | rcu_read_lock(); |
1d7138de | 2642 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 | 2643 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
60d9b031 DA |
2644 | (pmc->multi.imr_ifindex == dif || |
2645 | (sdif && pmc->multi.imr_ifindex == sdif))) | |
1da177e4 LT |
2646 | break; |
2647 | } | |
c85bb41e | 2648 | ret = inet->mc_all; |
1da177e4 | 2649 | if (!pmc) |
c85bb41e | 2650 | goto unlock; |
1d7138de | 2651 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2652 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2653 | if (!psl) |
c85bb41e | 2654 | goto unlock; |
1da177e4 | 2655 | |
c71151f0 | 2656 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2657 | if (psl->sl_addr[i] == rmt_addr) |
2658 | break; | |
2659 | } | |
c85bb41e | 2660 | ret = 0; |
1da177e4 | 2661 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2662 | goto unlock; |
1da177e4 | 2663 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2664 | goto unlock; |
2665 | ret = 1; | |
2666 | unlock: | |
2667 | rcu_read_unlock(); | |
2668 | out: | |
2669 | return ret; | |
1da177e4 LT |
2670 | } |
2671 | ||
2672 | /* | |
2673 | * A socket is closing. | |
2674 | */ | |
2675 | ||
2676 | void ip_mc_drop_socket(struct sock *sk) | |
2677 | { | |
2678 | struct inet_sock *inet = inet_sk(sk); | |
2679 | struct ip_mc_socklist *iml; | |
877acedc | 2680 | struct net *net = sock_net(sk); |
1da177e4 | 2681 | |
51456b29 | 2682 | if (!inet->mc_list) |
1da177e4 LT |
2683 | return; |
2684 | ||
2685 | rtnl_lock(); | |
1d7138de | 2686 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2687 | struct in_device *in_dev; |
1da177e4 | 2688 | |
1d7138de | 2689 | inet->mc_list = iml->next_rcu; |
877acedc | 2690 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2691 | (void) ip_mc_leave_src(sk, iml, in_dev); |
00db4124 | 2692 | if (in_dev) |
1da177e4 | 2693 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2694 | /* decrease mem now to avoid the memleak warning */ |
2695 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2696 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2697 | } |
2698 | rtnl_unlock(); | |
2699 | } | |
2700 | ||
dbdd9a52 | 2701 | /* called with rcu_read_lock() */ |
2094acbb | 2702 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
1da177e4 LT |
2703 | { |
2704 | struct ip_mc_list *im; | |
e9897071 | 2705 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2706 | struct ip_sf_list *psf; |
2707 | int rv = 0; | |
2708 | ||
e9897071 ED |
2709 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2710 | if (mc_hash) { | |
c70eba74 | 2711 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2712 | |
2713 | for (im = rcu_dereference(mc_hash[hash]); | |
2714 | im != NULL; | |
2715 | im = rcu_dereference(im->next_hash)) { | |
2716 | if (im->multiaddr == mc_addr) | |
2717 | break; | |
2718 | } | |
2719 | } else { | |
2720 | for_each_pmc_rcu(in_dev, im) { | |
2721 | if (im->multiaddr == mc_addr) | |
2722 | break; | |
2723 | } | |
1da177e4 LT |
2724 | } |
2725 | if (im && proto == IPPROTO_IGMP) { | |
2726 | rv = 1; | |
2727 | } else if (im) { | |
2728 | if (src_addr) { | |
23d2b940 | 2729 | spin_lock_bh(&im->lock); |
c71151f0 | 2730 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2731 | if (psf->sf_inaddr == src_addr) |
2732 | break; | |
2733 | } | |
2734 | if (psf) | |
2735 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2736 | psf->sf_count[MCAST_EXCLUDE] != | |
2737 | im->sfcount[MCAST_EXCLUDE]; | |
2738 | else | |
2739 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
23d2b940 | 2740 | spin_unlock_bh(&im->lock); |
1da177e4 LT |
2741 | } else |
2742 | rv = 1; /* unspecified source; tentatively allow */ | |
2743 | } | |
1da177e4 LT |
2744 | return rv; |
2745 | } | |
2746 | ||
2747 | #if defined(CONFIG_PROC_FS) | |
2748 | struct igmp_mc_iter_state { | |
7091e728 | 2749 | struct seq_net_private p; |
1da177e4 LT |
2750 | struct net_device *dev; |
2751 | struct in_device *in_dev; | |
2752 | }; | |
2753 | ||
2754 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2755 | ||
2756 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2757 | { | |
7091e728 | 2758 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2759 | struct ip_mc_list *im = NULL; |
2760 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2761 | ||
7562f876 | 2762 | state->in_dev = NULL; |
61fbab77 | 2763 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2764 | struct in_device *in_dev; |
6baff150 ED |
2765 | |
2766 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2767 | if (!in_dev) |
2768 | continue; | |
1d7138de | 2769 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2770 | if (im) { |
2771 | state->in_dev = in_dev; | |
2772 | break; | |
2773 | } | |
1da177e4 LT |
2774 | } |
2775 | return im; | |
2776 | } | |
2777 | ||
2778 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2779 | { | |
2780 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2781 | |
1d7138de ED |
2782 | im = rcu_dereference(im->next_rcu); |
2783 | while (!im) { | |
6baff150 | 2784 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2785 | if (!state->dev) { |
2786 | state->in_dev = NULL; | |
2787 | break; | |
2788 | } | |
6baff150 | 2789 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2790 | if (!state->in_dev) |
2791 | continue; | |
1d7138de | 2792 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2793 | } |
2794 | return im; | |
2795 | } | |
2796 | ||
2797 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2798 | { | |
2799 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2800 | if (im) | |
2801 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2802 | --pos; | |
2803 | return pos ? NULL : im; | |
2804 | } | |
2805 | ||
2806 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2807 | __acquires(rcu) |
1da177e4 | 2808 | { |
61fbab77 | 2809 | rcu_read_lock(); |
1da177e4 LT |
2810 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2811 | } | |
2812 | ||
2813 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2814 | { | |
2815 | struct ip_mc_list *im; | |
2816 | if (v == SEQ_START_TOKEN) | |
2817 | im = igmp_mc_get_first(seq); | |
2818 | else | |
2819 | im = igmp_mc_get_next(seq, v); | |
2820 | ++*pos; | |
2821 | return im; | |
2822 | } | |
2823 | ||
2824 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2825 | __releases(rcu) |
1da177e4 LT |
2826 | { |
2827 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2828 | |
2829 | state->in_dev = NULL; | |
1da177e4 | 2830 | state->dev = NULL; |
61fbab77 | 2831 | rcu_read_unlock(); |
1da177e4 LT |
2832 | } |
2833 | ||
2834 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2835 | { | |
2836 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2837 | seq_puts(seq, |
1da177e4 LT |
2838 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2839 | else { | |
2840 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2841 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2842 | char *querier; | |
a399a805 ED |
2843 | long delta; |
2844 | ||
1da177e4 LT |
2845 | #ifdef CONFIG_IP_MULTICAST |
2846 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2847 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2848 | "V3"; | |
2849 | #else | |
2850 | querier = "NONE"; | |
2851 | #endif | |
2852 | ||
e6b68883 | 2853 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2854 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2855 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2856 | } |
2857 | ||
a399a805 | 2858 | delta = im->timer.expires - jiffies; |
1da177e4 | 2859 | seq_printf(seq, |
338fcf98 | 2860 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2861 | im->multiaddr, im->users, |
a399a805 ED |
2862 | im->tm_running, |
2863 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2864 | im->reporter); |
2865 | } | |
2866 | return 0; | |
2867 | } | |
2868 | ||
f690808e | 2869 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2870 | .start = igmp_mc_seq_start, |
2871 | .next = igmp_mc_seq_next, | |
2872 | .stop = igmp_mc_seq_stop, | |
2873 | .show = igmp_mc_seq_show, | |
2874 | }; | |
2875 | ||
1da177e4 | 2876 | struct igmp_mcf_iter_state { |
7091e728 | 2877 | struct seq_net_private p; |
1da177e4 LT |
2878 | struct net_device *dev; |
2879 | struct in_device *idev; | |
2880 | struct ip_mc_list *im; | |
2881 | }; | |
2882 | ||
2883 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2884 | ||
2885 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2886 | { | |
7091e728 | 2887 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2888 | struct ip_sf_list *psf = NULL; |
2889 | struct ip_mc_list *im = NULL; | |
2890 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2891 | ||
7562f876 PE |
2892 | state->idev = NULL; |
2893 | state->im = NULL; | |
61fbab77 | 2894 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2895 | struct in_device *idev; |
6baff150 | 2896 | idev = __in_dev_get_rcu(state->dev); |
51456b29 | 2897 | if (unlikely(!idev)) |
1da177e4 | 2898 | continue; |
1d7138de | 2899 | im = rcu_dereference(idev->mc_list); |
00db4124 | 2900 | if (likely(im)) { |
1da177e4 LT |
2901 | spin_lock_bh(&im->lock); |
2902 | psf = im->sources; | |
00db4124 | 2903 | if (likely(psf)) { |
1da177e4 LT |
2904 | state->im = im; |
2905 | state->idev = idev; | |
2906 | break; | |
2907 | } | |
2908 | spin_unlock_bh(&im->lock); | |
2909 | } | |
1da177e4 LT |
2910 | } |
2911 | return psf; | |
2912 | } | |
2913 | ||
2914 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2915 | { | |
2916 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2917 | ||
2918 | psf = psf->sf_next; | |
2919 | while (!psf) { | |
2920 | spin_unlock_bh(&state->im->lock); | |
2921 | state->im = state->im->next; | |
2922 | while (!state->im) { | |
6baff150 | 2923 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2924 | if (!state->dev) { |
2925 | state->idev = NULL; | |
2926 | goto out; | |
2927 | } | |
6baff150 | 2928 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2929 | if (!state->idev) |
2930 | continue; | |
1d7138de | 2931 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2932 | } |
2933 | if (!state->im) | |
2934 | break; | |
2935 | spin_lock_bh(&state->im->lock); | |
2936 | psf = state->im->sources; | |
2937 | } | |
2938 | out: | |
2939 | return psf; | |
2940 | } | |
2941 | ||
2942 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2943 | { | |
2944 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2945 | if (psf) | |
2946 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2947 | --pos; | |
2948 | return pos ? NULL : psf; | |
2949 | } | |
2950 | ||
2951 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2952 | __acquires(rcu) |
1da177e4 | 2953 | { |
61fbab77 | 2954 | rcu_read_lock(); |
1da177e4 LT |
2955 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2956 | } | |
2957 | ||
2958 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2959 | { | |
2960 | struct ip_sf_list *psf; | |
2961 | if (v == SEQ_START_TOKEN) | |
2962 | psf = igmp_mcf_get_first(seq); | |
2963 | else | |
2964 | psf = igmp_mcf_get_next(seq, v); | |
2965 | ++*pos; | |
2966 | return psf; | |
2967 | } | |
2968 | ||
2969 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2970 | __releases(rcu) |
1da177e4 LT |
2971 | { |
2972 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
00db4124 | 2973 | if (likely(state->im)) { |
1da177e4 LT |
2974 | spin_unlock_bh(&state->im->lock); |
2975 | state->im = NULL; | |
2976 | } | |
1d7138de | 2977 | state->idev = NULL; |
1da177e4 | 2978 | state->dev = NULL; |
61fbab77 | 2979 | rcu_read_unlock(); |
1da177e4 LT |
2980 | } |
2981 | ||
2982 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2983 | { | |
2984 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2985 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2986 | ||
2987 | if (v == SEQ_START_TOKEN) { | |
1744bea1 | 2988 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
1da177e4 LT |
2989 | } else { |
2990 | seq_printf(seq, | |
2991 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2992 | "0x%08x %6lu %6lu\n", |
2993 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2994 | ntohl(state->im->multiaddr), |
2995 | ntohl(psf->sf_inaddr), | |
2996 | psf->sf_count[MCAST_INCLUDE], | |
2997 | psf->sf_count[MCAST_EXCLUDE]); | |
2998 | } | |
2999 | return 0; | |
3000 | } | |
3001 | ||
f690808e | 3002 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
3003 | .start = igmp_mcf_seq_start, |
3004 | .next = igmp_mcf_seq_next, | |
3005 | .stop = igmp_mcf_seq_stop, | |
3006 | .show = igmp_mcf_seq_show, | |
3007 | }; | |
3008 | ||
2c8c1e72 | 3009 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 3010 | { |
7091e728 | 3011 | struct proc_dir_entry *pde; |
93a714d6 | 3012 | int err; |
7091e728 | 3013 | |
c3506372 CH |
3014 | pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops, |
3015 | sizeof(struct igmp_mc_iter_state)); | |
7091e728 AD |
3016 | if (!pde) |
3017 | goto out_igmp; | |
c3506372 CH |
3018 | pde = proc_create_net("mcfilter", 0444, net->proc_net, |
3019 | &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state)); | |
7091e728 AD |
3020 | if (!pde) |
3021 | goto out_mcfilter; | |
93a714d6 MC |
3022 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
3023 | SOCK_DGRAM, 0, net); | |
3024 | if (err < 0) { | |
3025 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
3026 | err); | |
3027 | goto out_sock; | |
3028 | } | |
3029 | ||
1da177e4 | 3030 | return 0; |
7091e728 | 3031 | |
93a714d6 MC |
3032 | out_sock: |
3033 | remove_proc_entry("mcfilter", net->proc_net); | |
7091e728 | 3034 | out_mcfilter: |
ece31ffd | 3035 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
3036 | out_igmp: |
3037 | return -ENOMEM; | |
3038 | } | |
3039 | ||
2c8c1e72 | 3040 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 3041 | { |
ece31ffd G |
3042 | remove_proc_entry("mcfilter", net->proc_net); |
3043 | remove_proc_entry("igmp", net->proc_net); | |
93a714d6 | 3044 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
7091e728 AD |
3045 | } |
3046 | ||
3047 | static struct pernet_operations igmp_net_ops = { | |
3048 | .init = igmp_net_init, | |
3049 | .exit = igmp_net_exit, | |
3050 | }; | |
72c1d3bd | 3051 | #endif |
7091e728 | 3052 | |
4aa5dee4 JP |
3053 | static int igmp_netdev_event(struct notifier_block *this, |
3054 | unsigned long event, void *ptr) | |
3055 | { | |
3056 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3057 | struct in_device *in_dev; | |
3058 | ||
3059 | switch (event) { | |
3060 | case NETDEV_RESEND_IGMP: | |
3061 | in_dev = __in_dev_get_rtnl(dev); | |
3062 | if (in_dev) | |
3063 | ip_mc_rejoin_groups(in_dev); | |
3064 | break; | |
3065 | default: | |
3066 | break; | |
3067 | } | |
3068 | return NOTIFY_DONE; | |
3069 | } | |
3070 | ||
3071 | static struct notifier_block igmp_notifier = { | |
3072 | .notifier_call = igmp_netdev_event, | |
3073 | }; | |
3074 | ||
72c1d3bd | 3075 | int __init igmp_mc_init(void) |
7091e728 | 3076 | { |
72c1d3bd | 3077 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
3078 | int err; |
3079 | ||
3080 | err = register_pernet_subsys(&igmp_net_ops); | |
3081 | if (err) | |
3082 | return err; | |
3083 | err = register_netdevice_notifier(&igmp_notifier); | |
3084 | if (err) | |
3085 | goto reg_notif_fail; | |
3086 | return 0; | |
3087 | ||
3088 | reg_notif_fail: | |
3089 | unregister_pernet_subsys(&igmp_net_ops); | |
3090 | return err; | |
72c1d3bd WC |
3091 | #else |
3092 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 3093 | #endif |
72c1d3bd | 3094 | } |